Circuit breaker with sensor

Abstract

A circuit breaker with a sensor comprises a thin film pressure sensor, a closing latch, a spring, an energy storage rocker arm, a pull rope, a shell, a through hole, a fixing frame, a rotating shaft, a worm gear, a motor, a worm and a controller. According to the invention, the thin film pressure sensor is arranged, when the spring is fatigued, the pressure on the closing latch is reduced, and when the pressure value detected by the thin film pressure sensor is smaller than the set value, the thin film pressure sensor sends a signal to the controller, and the controller starts the motor, so that the worm gear rotates; the spring is stretched, so that the elastic potential energy stored by the energy storage mechanism is improved, and the normal work of the circuit breaker is ensured; therefore, the normal use of the circuit is prevented from being influenced by frequent replacement of the spring.

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 process of high-voltage circuit breakers requires the operating mechanism to provide it with relatively large power. Therefore, most circuit breaker mechanisms adopt the structure of energy storage + tripping. When closing, first use electric or manual energy storage operation to stretch the closing spring, so that the operating mechanism has elastic potential energy, and it is caught by the tripping mechanism, and the mechanism maintains the potential energy. During the closing operation, the personnel press the corresponding button (or the coil is energized to push the button), and use a small force to open the snap-on parts of the tripping mechanism. The large potential energy of the mechanism is released instantly, driving the circuit breaker to close. During the closing process, the opening spring is also stretched and stored to prepare for the opening action, and it is also caught by the opening tripping mechanism. When opening, it is similar to closing, and a small force is used to open the snap-on parts of the tripping mechanism. (The difference between opening and closing is that there is no energy storage operation, and the closing operation is also the energy storage operation of the opening.) However, after long-term use, the existing conventional circuit breakers will have fatigued springs, so the elastic force generated by them will be weaker than before. At this time, when the closing latch is disengaged and the elastic potential energy is released, the circuit breaker cannot be closed, or it cannot be maintained after closing. A slight shake will cause the circuit breaker to open, causing the circuit breaker to not work normally. For this problem, in existing circuit breakers, the spring is generally replaced, but this method will cause the circuit breaker to stop, thereby affecting the normal use of the circuit. Summary of the invention

[0003] The object of the present invention is to provide a circuit breaker with a sensor to solve the problems mentioned in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides a circuit breaker with a sensor, comprising a shell, a spring connected to an energy storage rocker arm at one end, characterized in that it comprises a closing latch provided with a film pressure sensor, the film pressure sensor is used to identify the pressure applied to the closing latch, a pull rope is fixedly connected to the other end of the spring away from the energy storage rocker arm, a through hole is provided on the shell for the spring to move, a fixed frame is provided at the bottom of the shell, the interior of the shell 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 wheel is fixedly connected to the rotating shaft, a motor is also fixedly connected to the fixed frame, a worm meshing with the worm wheel is fixedly connected to the output end of the motor, the worm is rotatably connected to the interior of the fixed frame, and the motor and the film pressure sensor are both electrically connected to a controller.

[0005] 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.

[0006] Furthermore, a fixing rod is fixedly connected to one end of the spring, and an end of the fixing rod facing away from the spring is connected to the limiting column via a universal ball joint.

[0007] Furthermore, the support frame is provided with a sleeve that cooperates with the limit column gap, and the outer circle of the limit column is provided with a plurality of notches. The limiting mechanism includes a support block fixed to the sleeve, and the support block is internally slidably connected with a top block, one end of the top block passes through the sleeve and cooperates with the notch, the notch has a side close to the pull rope that is flat, and a side away from the pull rope that is an inclined surface, and the end of the top block away from the limit column is connected to the inner wall of the support block through a compression spring.

[0008] 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.

[0009] Furthermore, the support frame also includes two adjusting rods connected to the sleeve through a connecting plate, a slider is fixedly connected to the bottom of each adjusting rod, a slide rail slidably connected to the slide rail is fixedly connected to the shell, a locking bolt is threadedly connected to the slide rail, the bottom of the locking bolt is tightly pressed 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.

[0010] Furthermore, the sliding block is provided with a dovetail groove, the sliding rail is provided with a convex strip which is loosely matched with the dovetail groove, and the bottom of the locking bolt is pressed tightly against the top of the convex strip.

[0011] 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.

[0012] Furthermore, both ends of the convex strip are threadedly connected with fixing bolts.

[0013] 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 shell opposite to the fixed frame, and the partition is provided with a hole for the pull rope to move.

[0014] Furthermore, the closing latch includes a rotating block fixedly connected to the output shaft of the tripping mechanism, and the end of the rotating block is a pressure-bearing surface for limiting the release of elastic potential energy of the spring. The rotating block is made of spring steel, and an L-shaped placement groove is provided on the rotating block. The film pressure sensor is mounted on the L-shaped placement groove, and the difference between the width of the L-shaped placement groove and the thickness of the film pressure sensor is in the range of 0.3mm-0.8mm.

[0015] Beneficial effects of the present invention: A thin film pressure sensor is provided on the present invention. When the spring becomes fatigued, the pressure on the closing latch becomes smaller. 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 to rotate 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; thereby avoiding frequent replacement of the spring and affecting the normal use of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0017] Figure 1 It is a partial front view of the mechanism in the existing circuit breaker when storing energy; Figure 2 It is a partial side view of the mechanism in the existing circuit breaker when storing energy; Figure 3 is a cross-sectional schematic diagram of a fixing frame in the present invention; Figure 4 It is a cross-sectional schematic diagram of the connection between the limiting column and the sleeve in the present invention; Figure 5 It is a structural schematic diagram of the closing latch in the present invention.

[0018] In the figure: 1. pressure-bearing surface; 2. L-shaped placement groove; 3. film pressure sensor; 4. rotating block; 5. spring; 6. fixing rod; 7. adjusting rod; 8. notch; 9. fixing 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

[0019] 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 construed as limiting the present invention.

[0020] 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 is used to identify the pressure exerted on the closing latch 32, the other end of the spring 5 away from the energy storage rocker arm 30 is fixedly connected with a pull rope 16, the housing 21 is provided with a through hole 24 for the spring 5 to move, the bottom of the housing 21 is provided with a fixing frame 9, the interior of the housing 21 is connected to the fixing frame 9 through the through hole 24, the pull rope 16 passes through the through hole 24 and is wrapped around The rotating shaft 13 is wound around the rotating shaft 13, and the rotating shaft 13 is rotatably connected to the inside of the fixed frame 9. A worm wheel 14 is fixedly connected to the rotating shaft 13, and a motor 12 is also fixedly connected to the fixed frame 9. A worm 15 meshing with the worm wheel 14 is fixedly connected to the output end of the motor 12. 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 housing 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 the spring 5 is in the closed state, the controller collects and conditions the differential signal (millivolt signal) of the film pressure sensor 3, converts the analog quantity of the film pressure sensor 3 into a visible digital signal, and displays it, so as to understand the pressure of the moving block in real time, and then can feedback the elastic potential energy of the spring 5; therefore, when the spring 5 is fatigued, the pressure on the closing latch 32 becomes smaller, so the pressure detected by the film pressure sensor 3 decreases, and when the pressure value detected by the film pressure sensor 3 is less than the set value, the film pressure sensor 3 will send a signal to the controller, and the controller will start the motor 12, so that the worm gear 14 will rotate, and then the spring 5 will be stretched, so as to increase the elastic potential energy stored in the energy storage mechanism, so as to ensure the normal operation of the circuit breaker; thereby avoiding the frequent replacement of the spring 5 and affecting the normal use of the circuit; in addition, the meshing of the worm gear 14 and the worm 15 can produce self-locking to prevent the spring 5 from retracting when the motor 12 stops working; and the through hole 24 provides sufficient space for the stretching of the spring 5 to prevent the spring 5 from twisting.

[0021] 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 in a stretched state continuously, thereby improving the service life of the pull rope 16; and one end of the spring 5 is fixedly connected to a 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 ball joint 20, thereby preventing the spring 5 from being abnormally twisted during the stretching process and ensuring the service life of the spring 5; a sleeve 25 that is clearance-matched with the limit column 18 is provided on the support frame, and a plurality of notches 8 are provided on the outer circle of the limit column 18, and the limit mechanism includes a support block 17 fixedly connected to the sleeve 25, and a top block 26 is slidably connected to the inside of the support block 17, and one end of the top block 26 passes through the sleeve 25 and cooperates with the notch 8, and the notch 8 has a side close to the pull rope 16 that is flat, and a side away from the pull rope 16 that is flat. 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, so as to realize the unidirectional movement of the limiting column 18. When the pull rope 16 stretches the spring 5 to the appropriate position and the motor 12 stops, the limiting column 18 remains motionless under the limit of the top block 26, which forms a double insurance with the self-locking generated by the meshing 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 slot 28 is provided on the support block 17, and a positioning column 29 penetrating the straight slot 28 is fixedly connected to the top block 26; 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 slot 28 close to the limiting column 18, and an inclined surface is provided at the top block 26 engaged with the inclined surface in the notch 8, and there is a gap between the bottom of the inclined surface and the outer circle of the limiting column 18, which can unlock the unidirectional movement of the limiting column 18, so as to facilitate the debugging and replacement of the new spring 5.

[0022] 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 fixedly connected to the bottom of each adjusting rod 7, and a slide rail 23 slidably connected to the slider 22 is fixedly connected to the shell 21, and 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 surface 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.

[0023] 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. 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 in 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, the spring 5 is replaced in time to prevent the normal operation of the circuit breaker from being affected by the sudden breakage of the spring 5.

[0024] 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 wheel 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, and 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 wheel 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, and 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, wherein the difference of 0.3mm is the minimum difference for easy mounting 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.

[0025] 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 the set value, the film pressure sensor 3 will send a signal to the controller, and the controller will start the motor 12, so that the worm gear 14 will rotate, and then the spring 5 will be stretched, thereby increasing the elastic potential energy stored in the energy storage mechanism and ensuring the normal operation of the circuit breaker; thereby avoiding the frequent replacement of the spring 5 and affecting the normal use of the circuit.

[0026] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by 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), the other end of the spring (5) away from the energy storage rocker arm (30) is fixedly connected with a pull rope (16), the shell (21) is provided with a through hole (24) for the spring (5) to move, the bottom of the shell (21) is provided with a fixing frame (9), the interior of the shell (21) is connected to the fixing frame (9) through the through hole (24), and the pull rope (16) is fixedly connected to the other end of the spring (5) away from the energy storage rocker arm (30), the shell (21) is provided with a through hole (24) for the spring (5) to move, the bottom of the shell (21) is provided with a fixing frame (9), the interior of the shell (21) is connected to the fixing frame (9) through the through hole (24), and the pull rope (16) is fixedly connected to the fixing frame (9) through the through hole (24). 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), a worm (15) meshing with the worm gear (14) is fixedly connected to the output end of the motor (12), 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.

2. The circuit breaker with sensor according to claim 1, characterized in that: 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 mounted on the housing (21); and a limiting mechanism for limiting unidirectional movement of the limiting column (18) is provided on the support frame.

3. The circuit breaker with sensor according to claim 2, 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).

4. The circuit breaker with sensor according to claim 2, characterized in that: The support frame is provided with a sleeve (25) which is clearance-matched with the limiting column (18); a plurality of notches (8) are provided on the outer circle of the limiting column (18); the limiting mechanism comprises a supporting block (17) fixedly connected to the sleeve (25); a top block (26) is slidably connected inside the supporting block (17); one end of the top block (26) passes through the sleeve (25) and is matched with the notch (8); a side of the notch (8) close to the pull rope (16) is a plane, and a side away from the pull rope (16) is an inclined surface; an end of the top block (26) away from the limiting column (18) is connected to the inner wall of the supporting block (17) through a compression spring (27).

5. The circuit breaker with sensor according to claim 4, characterized in that: The support block (17) is provided with a straight notch (28), and the top block (26) is fixedly connected with a positioning column (29) penetrating 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) 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).

6. The circuit breaker with sensor according to claim 4, 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 fixedly connected to the bottom of each adjusting rod (7), a slide rail (23) slidably connected to the slider (22) is fixedly connected to the housing (21), a locking bolt is threadedly connected to the slider (22), the bottom of the locking bolt is pressed tightly 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 surface of the eccentric wheel (31) in the energy storage rocker arm (30).

7. The circuit breaker with sensor according to claim 6, characterized in that: The slide block (22) is provided with a dovetail groove, the slide rail (23) is provided with a convex strip which is loosely matched with the dovetail groove, and the bottom of the locking bolt is pressed tightly against the top of the convex strip.

8. The circuit breaker with sensor according to claim 7, 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).

9. The circuit breaker with 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 housing (21) opposite to the fixed frame (9); and a hole is provided on the partition (11) for the pull rope (16) to move.

10. The circuit breaker with sensor according to any one of claims 1 to 9, characterized in that: The closing latch (32) comprises a rotating block (4) fixedly connected 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 rotating block (4) is made of spring steel, and an L-shaped placement groove (2) is provided on the rotating block (4), and the thin film pressure sensor (3) is mounted on the L-shaped placement groove (2); 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