A circuit breaker with a sensor

Abstract

A circuit breaker with a sensor includes a film pressure sensor, a closing latch, a spring, an energy storage rocker arm, a pull rope, a housing, a through hole, a fixing frame, a rotating shaft, a worm gear, a motor, a worm, and a controller. The film pressure sensor is provided on the closing latch. When the spring fatigues, the pressure on the closing latch decreases. When the pressure value detected by the film pressure sensor is less than its set value, the film pressure sensor sends a signal to the controller, which starts the motor, thereby rotating the worm gear, thereby stretching the spring, thereby increasing the elastic potential energy stored in the energy storage mechanism, thereby ensuring the normal operation of the circuit breaker. Frequent spring replacement is avoided, which affects the normal use of the circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a circuit breaker with a 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 their springs, which weakens the elastic force they generate. Consequently, when the closing latch disengages and releases its elastic potential energy, the circuit breaker cannot close, or even remain closed. Even a slight shake can cause the circuit breaker to open, causing the circuit breaker to malfunction. To address this issue, existing circuit breakers generally replace the springs, but this approach can cause the circuit breaker to shut down, affecting the normal operation of the circuit. Summary of the Invention

[0004] An object of the present invention is to provide a circuit breaker with a sensor to solve the problems mentioned in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides a circuit breaker with a sensor, comprising a housing, a spring connected to an energy storage rocker arm at one end, and characterized in that it includes a closing latch provided with a thin film pressure sensor, the thin film pressure sensor is used to identify the pressure applied to the closing latch, a pull rope is fixed to the other end of the spring away from the energy storage rocker arm, a through hole is provided on the housing for movement of the spring, a fixed frame is provided at the bottom of the housing, the interior of the housing is connected to the fixed frame through the through hole, the pull rope passes through the through hole and is wound around a rotating shaft, the rotating shaft is rotatably connected to the interior of the fixed frame, a worm gear is fixed to the rotating shaft, a motor is also fixed to the fixed frame, a worm meshing with the worm gear is fixed to the output end of the motor, the worm is rotatably connected to the interior of the fixed frame, and the motor and the thin film pressure sensor are both electrically connected to a controller.

[0006] Furthermore, a limiting column is provided between the spring and the pull rope, the limiting column is slidably connected to a support frame installed on the shell, and the support frame is provided with a limiting mechanism for limiting the unidirectional movement of the limiting column.

[0007] Furthermore, one end of the spring is fixedly connected to a fixing rod, and one end of the fixing rod facing away from the spring is connected to the limiting column through a universal ball joint.

[0008] Furthermore, the support frame is provided with a sleeve that is gap-matched with the limiting column, and a plurality of notches are provided on the outer circle of the limiting column. The limiting mechanism includes a support block fixed to the sleeve, and a top block is slidably connected to the inside of the support block. One end of the top block passes through the sleeve and cooperates with the notch. The side of the notch close to the pull rope is a plane, and the side away from the pull rope is an inclined surface. The end of the top block away from the limiting column is connected to the inner wall of the support block through a compression spring.

[0009] Furthermore, a straight slot is provided on the support block, and a positioning column passing through the straight slot is fixedly connected to the top block; when the end of the top block engages with the notch, the positioning column is tightly attached to the end of the straight slot close to the limiting column, and an inclined surface is provided at the top block that engages with the inclined surface in the notch, and there is a gap between the bottom of the inclined surface and the outer circle of the limiting column.

[0010] Furthermore, the support frame also includes two adjusting rods connected to the sleeve through a connecting plate, a slider is fixed to the bottom of each adjusting rod, a slide rail is fixed to the shell and slidably connected to the slider, a locking bolt is threadedly connected to the slider, and the bottom of the locking bolt is pressed tightly against the top of the slide rail, the two slide rails are symmetrically distributed relative to the center of the through hole and the extension direction of the slide rail is parallel to the end face of the eccentric wheel in the energy storage rocker arm.

[0011] Furthermore, the slider is provided with a dovetail groove, the slide rail is provided with a convex strip that is gap-matched with the dovetail groove, and the bottom of the locking bolt is pressed tightly against the top of the convex strip.

[0012] The fixing frame is provided with a transparent opening and closing door, and the outer circle of the limiting column is coated with a red warning area, and the red warning area is located at one end of the limiting column close to the spring.

[0013] Furthermore, both ends of the convex strip are threadedly connected with fixing bolts.

[0014] Furthermore, the fixed frame is provided with an opening and closing door, and a partition is provided inside the fixed frame, the worm wheel and the worm are located between the partition and the inner wall of the fixed frame away from the shell, and the partition is provided with a hole for the pull rope to move.

[0015] Furthermore, the closing latch includes a rotating block fixed to the output shaft of the tripping mechanism, the end of the rotating block is a pressure-bearing surface, which is used to limit the release of elastic potential energy of the spring, the material of the rotating block is spring steel, and an L-shaped placement groove is provided on the rotating block, and the thin film pressure sensor is mounted on the L-shaped placement groove. The difference between the width of the L-shaped placement groove and the thickness of the thin film pressure sensor is in the range of 0.3mm-0.8mm.

[0016] Beneficial effects of the present invention: A thin film pressure sensor is provided on the circuit breaker. When the spring becomes fatigued, the pressure on the closing latch decreases. When the pressure value detected by the thin film pressure sensor is less than the set value, the thin film pressure sensor will send a signal to the controller, and the controller will start the motor, thereby rotating the worm gear and stretching the spring, thereby increasing the elastic potential energy stored in the energy storage mechanism, thereby ensuring the normal operation of the circuit breaker; thereby avoiding frequent spring replacement and affecting the normal use of the circuit. 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 This is a partial main view of the existing circuit breaker when the mechanism is storing energy;

[0019] Figure 2 It is a partial side view of the mechanism in the existing circuit breaker when storing energy;

[0020] Figure 3 is a schematic cross-sectional view of the fixing frame of the present invention;

[0021] Figure 4 It is a cross-sectional schematic diagram of the connection between the limiting column and the sleeve in the present invention;

[0022] Figure 5 It is a structural schematic diagram of the closing latch in the present invention.

[0023] In the figure: 1. Pressure-bearing surface; 2. L-shaped placement groove; 3. Thin film pressure sensor; 4. Rotating block; 5. Spring; 6. Fixed rod; 7. Adjusting rod; 8. Notch; 9. Fixed frame; 10. Connecting plate; 11. Partition; 12. Motor; 13. Rotating shaft; 14. Worm gear; 15. Worm; 16. Pull rope; 17. Support block; 18. Limit column; 19. Red warning area; 20. Universal ball joint; 21. Housing; 22. Slider; 23. Slide rail; 24. Through hole; 25. Sleeve; 26. Top block; 27. Compression spring; 28. Straight slot; 29. Positioning column; 30. Energy storage rocker arm; 31. Eccentric wheel; 32. Closing latch. DETAILED DESCRIPTION

[0024] 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.

[0025] In one embodiment, Figure 1-5 As shown, a circuit breaker with a sensor includes a housing 21, a spring 5 connected to an energy storage rocker arm 30 at one end, a closing latch 32 provided with a film pressure sensor 3, the film pressure sensor 3 being used to identify the pressure exerted on the closing latch 32, a pull rope 16 fixed to the other end of the spring 5 away from the energy storage rocker arm 30, a through hole 24 for the spring 5 to move is provided on the housing 21, a fixing frame 9 is provided at the bottom of the housing 21, the interior of the housing 21 is connected to the fixing frame 9 through the through hole 24, and the pull rope 16 passes through the through hole 24 and is wrapped around Wrapped around the rotating shaft 13, the rotating shaft 13 is rotatably connected to the inside of the fixed frame 9, a worm gear 14 is fixed to the rotating shaft 13, and a motor 12 is also fixed to the fixed frame 9. A worm 15 meshing with the worm gear 14 is fixed to the output end of the motor 12, and the worm 15 is rotatably connected to the inside of the fixed frame 9. The motor 12 and the film pressure sensor 3 are both electrically connected to the controller, wherein the housing 21 is the bottom shell in the original circuit breaker, and the energy storage rocker arm 30 is installed on the eccentric wheel 31 in the energy storage mechanism of the circuit breaker; when the closing latch 32 is under pressure When in the closed state, the controller collects and conditions the differential signal (millivolt-level signal) from the membrane pressure sensor 3, converting the analog signal from the membrane pressure sensor 3 into a visual digital signal for display. This provides real-time information on the pressure of the moving block and, in turn, provides feedback on the elastic potential energy of the spring 5. Therefore, when the spring 5 fatigues, the pressure on the closing latch 32 decreases, and thus the pressure detected by the membrane pressure sensor 3 decreases. When the pressure value detected by the membrane pressure sensor 3 is less than the set value, the membrane pressure sensor 3 sends a signal to the controller, which activates the motor 12, thereby rotating the worm gear 14, thereby stretching the spring 5, thereby increasing the elastic potential energy stored in the energy storage mechanism and ensuring the normal operation of the circuit breaker. This avoids frequent replacement of the spring 5, which could affect the normal operation of the circuit. In addition, the meshing of the worm gear 14 and the worm 15 creates a self-locking effect, preventing the spring 5 from retracting when the motor 12 stops operating. The through hole 24 provides ample space for the spring 5 to stretch, preventing it from twisting.

[0026] In this embodiment, a limit column 18 is provided between the spring 5 and the pull rope 16, and the limit column 18 is slidably connected to the support frame installed on the shell 21. The support frame is provided with a limit mechanism for limiting the unidirectional movement of the limit column 18, thereby preventing the pull rope 16 from being continuously in a stretched state, thereby improving the service life of the pull rope 16; and one end of the spring 5 is fixedly connected to the fixing rod 6, and the end of the fixing rod 6 away from the spring 5 is connected to the limit column 18 through a universal joint 20, thereby preventing the spring 5 from abnormally twisting during the stretching process, thereby ensuring the service life of the spring 5; a sleeve 25 is provided on the support frame, which is clearance-matched with the limit column 18, and a plurality of notches 8 are provided on the outer circle of the limit column 18. The limit mechanism includes a support block 17 fixed to the sleeve 25, and the interior of the support block 17 is slidably connected to a top block 26, one end of the top block 26 passes through the sleeve 25 and cooperates with the notch 8, and the side of the notch 8 close to the pull rope 16 is flat, and the side away from the pull rope 16 is flat. The inclined surface, the end of the top block 26 away from the limiting column 18 is connected to the inner wall of the support block 17 through the compression spring 27, thereby realizing the unidirectional movement of the limiting column 18. When the pull rope 16 stretches the spring 5 to the appropriate position, the motor 12 stops and the limiting column 18 remains stationary under the limit of the top block 26. This forms a double insurance with the self-locking generated by the engagement of the worm wheel 14 and the worm 15. In addition, it can also prevent the spring 5 from retracting when the pull rope 16 breaks, causing damage to other parts of the circuit breaker. Destruction; a straight notch 28 is provided on the support block 17, and a positioning column 29 passing through the straight notch 28 is fixed to the top block 26; when the end of the top block 26 engages with the notch 8, the positioning column 29 is tightly attached to the end of the straight notch 28 close to the limit column 18, and an inclined surface is provided at the top block 26 that engages with the inclined surface in the notch 8. There is a gap between the bottom of the inclined surface and the outer circle of the limit column 18, which can unlock the unidirectional movement of the limit column 18, making it easy to debug and replace the new spring 5.

[0027] In this embodiment, the support frame also includes two adjusting rods 7 connected to the sleeve 25 through the connecting plate 10, and a slider 22 is fixed to the bottom of each adjusting rod 7, and a slide rail 23 slidably connected to the slider 22 is fixed to the housing 21. A locking bolt is threadedly connected to the slider 22, and the bottom of the locking bolt presses the top of the slide rail 23. The two slide rails 23 are symmetrically distributed relative to the center of the through hole 24, and the extension direction of the slide rail 23 is parallel to the end face of the eccentric wheel 31 in the energy storage rocker arm 30. By moving the position of the limit column 18, the debugging and installation of the spring 5 can be facilitated, and a dead point can be prevented from being formed between the spring 5 and the energy storage rocker arm 30, thereby ensuring that the circuit breaker can work normally.

[0028] In this embodiment, a dovetail groove is provided on the slider 22, and a convex strip that matches the gap of the dovetail groove is provided on the slide rail 23, and the bottom of the locking bolt presses the top of the convex strip, thereby realizing the sliding connection between the slider 22 and the slide rail 23 while ensuring the supporting quality of the adjusting rod 7; and a transparent opening and closing door is provided on the fixed frame 9, and a red warning area 19 is coated on the outer circle of the limit column 18. The red warning area 19 is located at one end of the limit column 18 close to the spring 5. As the pull rope 16 stretches the spring 5, the limit column 18 will gradually move toward the direction of the pull rope 16. When the red warning area 19 exceeds the top position of the sleeve 25, it means that the spring 5 is about to reach the fatigue limit. At this time, when the staff observes it, they replace the spring 5 in time to prevent the sudden breakage of the spring 5 from affecting the normal operation of the circuit breaker.

[0029] In this embodiment, both ends of the convex strip are threadedly connected with fixing bolts to prevent the slider 22 from moving out of the slide rail 23; a partition 11 is provided inside the fixed frame 9, and the worm gear 14 and the worm 15 are located between the partition 11 and the inner wall of the shell 21 opposite to the fixed frame 9. The partition 11 is provided with a hole for the pull rope 16 to move, which is convenient for the repair and maintenance of the worm gear 14 and the worm 15; in addition, the closing latch 32 includes a rotating block 4 fixed to the output shaft of the tripping mechanism, and the end of the rotating block 4 is a pressure-bearing surface 1 for limiting the release of elastic potential energy of the spring 5. The material of the rotating block 4 is spring steel, so the rotating block 4 has a certain elasticity, and an L-shaped placement groove 2 is provided on the rotating block 4. A thin film pressure sensor 3 is mounted on the L-shaped placement groove 2. When the pressure-bearing surface 1 is subjected to force, the L-shaped placement groove 2 The width of the L-shaped placement groove 2 becomes smaller under the action of pressure, thereby squeezing the film pressure sensor 3, and then realizing the detection of the pressure on the film pressure sensor 3; in addition, the difference between the width of the L-shaped placement groove 2 and the thickness of the film pressure sensor 3 is in the range of 0.3mm-0.8mm, among which the difference of 0.3mm is the minimum difference for easy installation of the film pressure sensor 3. When the difference is less than 0.3mm, the film pressure sensor 3 is difficult to install, and 0.8mm is the maximum difference of the effective squeezing of the film pressure sensor 3 by the side wall of the L-shaped placement groove 2 after finite element simulation analysis of the rotating block 4, that is, when the difference exceeds 0.8, the force on the pressure-bearing surface 1 is almost borne by the rotating block 4, and the detection effect of the film pressure sensor 3 is not ideal at this time.

[0030] Working principle: When the spring 5 becomes fatigued, the pressure on the rotating block 4 becomes smaller, so the pressure detected by the film pressure sensor 3 decreases. When the pressure value detected by the film pressure sensor 3 is less than its set value, the film pressure sensor 3 will send a signal to the controller, and the controller will start the motor 12, thereby rotating the worm gear 14, and then stretching the spring 5, thereby increasing the elastic potential energy stored in the energy storage mechanism and ensuring the normal operation of the circuit breaker; thereby avoiding frequent replacement of the spring 5 and affecting the normal use of the circuit.

[0031] 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 with a sensor, comprising a housing (21), a spring (5) having one end connected to an energy storage rocker arm (30), characterized in that: The invention comprises a closing latch (32) provided with a thin film pressure sensor (3), wherein the thin film pressure sensor (3) is used to identify the pressure applied to the closing latch (32), a pull rope (16) is fixedly connected to the other end of the spring (5) away from the energy storage rocker arm (30), a through hole (24) for the spring (5) to move is provided on the housing (21), a fixing frame (9) is provided at the bottom of the housing (21), the interior of the housing (21) is communicated with the fixing frame (9) through the through hole (24), and the pull rope (16) is fixed to the other end of the spring (5) away from the energy storage rocker arm (30), and a through hole (24) for the spring (5) to move is provided on the housing (21). 6) passes through the through hole (24) and is wound around the rotating shaft (13), the rotating shaft (13) is rotatably connected to the interior of the fixed frame (9), a worm gear (14) is fixedly connected to the rotating shaft (13), the fixed frame (9) is also fixedly connected to a motor (12), an output end of the motor (12) is fixedly connected to a worm (15) meshing with the worm gear (14), the worm (15) is rotatably connected to the interior of the fixed frame (9), and the motor (12) and the thin film pressure sensor (3) are both electrically connected to a controller; A limiting column (18) is provided between the spring (5) and the pull rope (16), the limiting column (18) is slidably connected to a support frame installed on the housing (21), and the support frame is provided with a limiting mechanism for limiting the unidirectional movement of the limiting column (18); The support frame is provided with a sleeve (25) which is clearance-matched with the limiting column (18), and a plurality of notches (8) are provided on the outer circle of the limiting column (18). The limiting mechanism includes a support block (17) fixed on the sleeve (25), and a top block (26) is slidably connected inside the support block (17). One end of the top block (26) passes through the sleeve (25) and matches with the notch (8). The side of the notch (8) close to the pull rope (16) is a plane, and the side away from the pull rope (16) is an inclined surface. The end of the top block (26) away from the limiting column (18) is connected to the inner wall of the support block (17) through a compression spring (27).

2. The circuit breaker with sensor according to claim 1, characterized in that: One end of the spring (5) is fixedly connected to a fixing rod (6), and the end of the fixing rod (6) facing away from the spring (5) is connected to the limiting column (18) via a universal ball joint (20).

3. The circuit breaker with a sensor according to claim 1, characterized in that: The support block (17) is provided with a straight notch (28), and the top block (26) is fixed with a positioning column (29) that passes through the straight notch (28); when the end of the top block (26) is engaged with the notch (8), the positioning column (29) is tightly attached to the end of the straight notch (28) close to the limiting column (18), and an inclined surface is provided at the top block (26) that is engaged with the inclined surface in the notch (8), and a gap exists between the bottom of the inclined surface and the outer circle of the limiting column (18).

4. The circuit breaker with a sensor according to claim 1, characterized in that: The support frame also includes two adjusting rods (7) connected to the sleeve (25) through a connecting plate (10), a slider (22) is fixed to the bottom of each adjusting rod (7), a slide rail (23) slidably connected to the slider (22) is fixed to the housing (21), a locking bolt is threadedly connected to the slider (22), the bottom of the locking bolt is pressed against the top of the slide rail (23), the two slide rails (23) are symmetrically distributed relative to the center of the through hole (24), and the extension direction of the slide rail (23) is parallel to the end face of the eccentric wheel (31) in the energy storage rocker arm (30).

5. The circuit breaker with sensor according to claim 4, characterized in that: The slider (22) is provided with a dovetail groove, the slide rail (23) is provided with a convex strip that is clearance-matched with the dovetail groove, and the bottom of the locking bolt is pressed tightly against the top of the convex strip.

6. The circuit breaker with a sensor according to claim 5, characterized in that: The fixed frame (9) is provided with a transparent opening and closing door, and the outer circle of the limiting column (18) is coated with a red warning area (19), and the red warning area (19) is located at one end of the limiting column (18) close to the spring (5).

7. The circuit breaker with a sensor according to claim 1, characterized in that: A partition (11) is provided inside the fixed frame (9), the worm wheel (14) and the worm (15) are located between the partition (11) and the inner wall of the fixed frame (9) facing away from the housing (21), and a hole is provided on the partition (11) for the pull rope (16) to move.

8. The circuit breaker with a sensor according to any one of claims 1 to 7, characterized in that: The closing latch (32) comprises a rotating block (4) fixedly connected to the output shaft of the tripping mechanism, the end of the rotating block (4) being a pressure-bearing surface (1) for limiting the release of elastic potential energy of the spring (5); the rotating block (4) is made of spring steel, an L-shaped placement groove (2) is provided on the rotating block (4), the thin film pressure sensor (3) is mounted on the L-shaped placement groove (2), and the difference between the width of the L-shaped placement groove (2) and the thickness of the thin film pressure sensor (3) is in the range of 0.3 mm to 0.8 mm.

Images