Auxiliary signal mechanism for opening and closing of moving contact of direct-current circuit breaker

Abstract

The utility model provides a direct current circuit breaker moving contact opening and closing auxiliary signal mechanism, comprising an auxiliary contact member comprising an outer frame, a trigger block, a microswitch, an opening shaft and a prompt block, the outer frame is fixed in a cabinet, a placing space is arranged in the outer frame, and the trigger block is arranged in the placing space; the number of the microswitches is multiple, the microswitches are correspondingly arranged on the two sides of the outer frame respectively, the prompt block is rotationally arranged at one end of the outer frame, an elastic piece is arranged between the end, close to the prompt block, of the trigger block and the outer frame, and the opening shaft penetrates through the outer frame, the trigger block and the elastic piece to make contact with the prompt block and drives the prompt block to rotate. The opening component is arranged on the frame supporting plate, an opening rod of the opening component extends into the outer frame and is in contact with the opening shaft, and an opening end of the opening component is arranged corresponding to a groove formed in the bottom of the moving contact. According to the utility model, the output of accurate and stable auxiliary signals can be ensured, and the stability of the whole mechanism can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers, and in particular relates to an auxiliary signal mechanism for opening and closing a moving contact of a DC circuit breaker. Background Art

[0002] Existing circuit breakers directly weld a small microswitch onto a printed circuit board. The microswitch is controlled by pressing and releasing the microswitch roller lever through a metal sheet metal box fixed on a metal shaft that can slide back and forth. The front end of the sliding shaft is painted green, and a red rubber sheet with a cross cut in the middle can be passed through to indicate the open and closed state of the moving contact.

[0003] The inner sleeve of the trip mechanism spring is directly fixed on the support plate, the metal end and the internal thread insert are cast on the outer sleeve together, the trip shaft is fixed to the threaded insert through a thread, the trip spring is placed inside, the metal end of the trip mechanism is pressed against the moving contact, the trip spring provides the trip force, the trip shaft is in contact with the signal mechanism shaft, and the hydraulic damping mechanism is fixed at the bottom to play a role of buffering and shock absorption.

[0004] Movement description: When the closing mechanism is energized and the moving contact is closed, the opening shaft is pushed to the left, thereby pushing the signal mechanism shaft, pressing the microswitch roller lever, outputting a closed signal, and the top of the signal mechanism shaft pushes out of the center of the rubber sheet, and the color changes visually; when the opening mechanism is energized, the opening spring provides the opening force, pushing the moving contact to rotate in the opposite direction, completing the opening, and the opening signal mechanism returns to its initial position under the action of the spring.

[0005] The above connection structure has the following problems:

[0006] (1) Since the control box is a sheet metal part with large size tolerance, the auxiliary contact trigger mechanism is fixed on the top of the control box, and the printed circuit board is inserted into the guide rail of the control box, resulting in a large position tolerance between the printed circuit board and the trigger mechanism. The small micro switch is directly welded on the printed circuit board, the micro switch trigger stroke is small, and the groove of the sheet metal box triggered by the mechanism is shallow. Therefore, when the micro switch is close to the sheet metal box, the micro switch will be damaged by overvoltage. When the micro switch is far away from the sheet metal box, the trigger action cannot be completed.

[0007] (2) The micro switches are closely arranged front and back. As the silver point is burned during use, the thickness decreases, and the compression stroke of the trip spring shaft becomes larger. When closing the switch, the sheet metal box moves to the left in the figure, the groove moves over, and the transmission signal is wrong.

[0008] (3) The entire trigger mechanism is made of sheet metal with large tolerances, complex structure and low strength. The sheet metal box is directly welded to the metal shaft. The rotation of the metal shaft will cause the sheet metal box to rub against the side wall, resulting in jerky movement and poor stability of the entire mechanism. The closed and open states are displayed as dots with a small area, which is difficult to observe and distinguish. The rubber sheet will be damaged by long-term friction.

[0009] (4) In the original scheme of the trip spring mechanism, the inner sleeve of the mechanism is directly fixed on the support plate and cannot move. The contact surface between the moving contact and the end of the outer sleeve is a plane, the friction force is large, and there is a large fluctuation. The outer sleeve of the mechanism and the trip shaft play a guiding role. The movement trajectory of the moving contact during the opening and closing process is a fan-shaped one. Therefore, the outer sleeve and inner shaft of the mechanism will always be subject to the constantly changing force of the vertical axis. After long-term operation, the trip shaft will loosen and the outer sleeve will crack.

[0010] (5) Since the inner sleeve of the trip spring mechanism is directly fixed on the frame support plate, the entire structure of the support plate needs to be dismantled before the trip mechanism can be replaced and repaired. In addition, the hydraulic damping mechanism will leak after long-term operation, and the entire structure of the support plate also needs to be dismantled before replacement and repair. This results in high equipment maintenance costs, extremely low maintainability, and huge pressure on subsequent operation and maintenance. Utility Model Content

[0011] In view of this, the present invention aims to provide an auxiliary signal mechanism for opening and closing the moving contacts of a DC circuit breaker to solve at least one of the above problems.

[0012] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0013] The utility model provides a DC circuit breaker moving contact opening and closing auxiliary signal mechanism, comprising:

[0014] An auxiliary contact member is disposed in the chassis and includes an outer frame, a trigger block, a micro switch, a trip shaft, and a prompt block. The outer frame is fixed in the chassis and has a built-in placement space. The trigger block is installed in the placement space.

[0015] There are multiple micro switches, which are respectively arranged on both sides of the outer frame. The prompt block is rotatably arranged at one end of the outer frame. An elastic member is arranged between the end of the trigger block close to the prompt block and the outer frame. The opening shaft passes through the outer frame, the trigger block, and the elastic member and contacts the prompt block to drive the prompt block to rotate.

[0016] The opening member is arranged on the frame support plate, the opening rod of the opening member extends into the outer frame and contacts the opening shaft, and the opening end of the opening member is arranged corresponding to the groove opened at the bottom of the moving contact.

[0017] Furthermore, the number of the micro switches is four, and they are symmetrically arranged on the outer walls of both sides of the outer frame. A gap is also reserved on the outer frame for the roller lever of the micro switch to move.

[0018] Furthermore, a mounting bracket is provided at one end of the outer frame, and the prompt block is rotatably provided on the mounting bracket via a rotating shaft;

[0019] The mounting bracket is also provided with a limiting rod for limiting the prompt block.

[0020] Furthermore, a through hole is provided on one side panel of the chassis, and the prompt block is correspondingly arranged at the through hole. The prompt block has a fan-shaped structure, and a two-color rubber sheet is pasted on it.

[0021] Furthermore, the elastic member is a reset spring, which is sleeved on the trip shaft. An inner groove is annularly provided on the trip shaft, and a retaining spring is installed in the inner groove for limiting the reset spring.

[0022] Furthermore, the tripping component includes a tripping base, an outer sleeve, an inner sleeve, a tripping spring, an embedded part, a tripping rod and a tripping end;

[0023] The switch-off base is arranged on the frame support plate, and an arc-shaped groove is opened on one side of the switch-off base. The tail of the inner sleeve is arranged as an arc-shaped protrusion and is correspondingly arranged in the arc-shaped groove.

[0024] One end of the trip rod is mounted in the outer sleeve via an embedded component, the trip spring is sleeved on the trip rod and mounted in the outer sleeve via an inner sleeve, and the other end of the trip rod passes through the inner sleeve and the arc-shaped groove, extends into the chassis, and contacts the trip shaft;

[0025] The opening end contacts a groove provided at the bottom of the moving contact.

[0026] Furthermore, the groove provided at the bottom of the moving contact is arc-shaped, and the opening end is provided with an arc-shaped structure matching the groove.

[0027] Compared with the prior art, the auxiliary signal mechanism for opening and closing the moving contact of a DC circuit breaker described in the present invention has the following beneficial effects:

[0028] The auxiliary signal mechanism for opening and closing the moving contact of a DC circuit breaker described in the utility model can ensure the output of accurate and stable auxiliary signals, help improve the stability of the entire mechanism, and enhance visual observation and resolution accuracy, thereby facilitating structural maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 This is a schematic structural diagram of a DC circuit breaker moving contact opening and closing auxiliary signal mechanism from a first angle according to an embodiment of the present utility model;

[0031] Figure 2 This is a schematic diagram of the second angle structure of a DC circuit breaker moving contact opening and closing auxiliary signal mechanism according to an embodiment of the present utility model;

[0032] Figure 3 This is a schematic diagram of the internal structure of the auxiliary contact member according to an embodiment of the present utility model;

[0033] Figure 4 This is a schematic diagram of the structure of the opening member according to an embodiment of the present utility model;

[0034] Figure 5 This is a cross-sectional view of an auxiliary signal mechanism for opening and closing the moving contact of a DC circuit breaker according to an embodiment of the present utility model.

[0035] Description of reference numerals:

[0036] 1- Chassis; 11- Through hole; 2- Auxiliary contact member; 21- Outer frame; 22- Trigger block; 23- Micro switch; 24- Disconnect shaft; 25- Prompt block; 26- Mounting bracket; 27- Rotating shaft; 28- Limit rod; 29- Reset spring; 210- Circlip; 3- Disconnect member; 31- Disconnect base; 32- Outer sleeve; 33- Inner sleeve; 34- Disconnect spring; 35- Inlaid part; 36- Disconnect rod; 37- Disconnect end; 38- Arc-shaped protrusion; 39- Arc-shaped groove. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039] See also Figure 1 、 Figure 2 and Figure 5 As shown, this embodiment provides a DC circuit breaker moving contact opening and closing auxiliary signal mechanism, including:

[0040] The auxiliary contact member 2 is arranged in the cabinet 1 and comprises an outer frame 21, a trigger block 22, a micro switch 23, a tripping shaft 24 and a prompt block 25, the outer frame 21 is fixed in the cabinet 1 and has a receiving space, and the trigger block 22 is arranged in the receiving space;

[0041] The micro switch 23 is provided in multiple numbers and arranged on both sides of the outer frame 21 respectively, the prompt block 25 is rotatably arranged at one end of the outer frame 21, the elastic member is arranged between the trigger block 22 close to the prompt block 25 and the outer frame 21, the tripping shaft 24 penetrates through the outer frame 21, the trigger block 22, the elastic member and the prompt block 25 and is in contact with the prompt block 25 to drive the prompt block 25 to rotate;

[0042] The tripping member 3 is arranged on the frame support plate, the tripping rod 36 of the tripping member 3 extends into the outer frame 21 and is in contact with the tripping shaft 24, and the tripping end 37 of the tripping member 3 is arranged in the groove arranged on the bottom of the movable contact in correspondence.

[0043] Preferably, the outer frame 21 is provided with a containing groove at one end close to the tripping member 3, and the tripping shaft 24 is provided with an end head arranged in the containing groove.

[0044] Specifically, in the embodiment, first, the small micro switch 23 of the auxiliary contact is replaced by a medium micro switch 23, and is no longer welded on the printed circuit board but fixed on the outer frame 21 of the trigger mechanism and fused with the trigger block 22 through the outer frame 21 to form an integral whole, so that the position tolerance of the two is more stable and controllable, and the stability of the tripping and closing signal output is ensured; second, the outer frame 21 of the trigger mechanism is changed from sheet metal to metal machining, the sheet metal box of the trigger is changed to the non-metallic machining trigger block 22, the sheet metal box of the tripping mechanism and the external support of the sheet metal process are changed to the trigger block 22 and the outer frame 21 of the machining, the tolerance of the parts is reduced, the cooperation of the structure and the parts is more stable and compact, the trigger block 22 is non-metallic with self-lubricating characteristics, the tripping shaft 24 penetrating through the outer frame 21 and the trigger block 22 can rotate freely, the structure movement is smooth, and the stability of the structure is increased; the end head and the rubber sheet are interchanged to change the color information, the scheme of the rotatable prompt block 25 is replaced, the problem of damage of the rubber sheet due to friction, aging and other reasons for a long time is solved, the display area is increased through the structure of the prompt block 25, and the visualization of the equipment state is enhanced.

[0045] The mechanism described in the embodiment can effectively ensure the output of correct and stable auxiliary signals, effectively improve the stability of the whole mechanism, and improve the visual observation and resolution accuracy, and the overall structure is convenient for maintenance.

[0046] In some embodiments, as shown in Figure 3 The number of micro switches 23 is four groups (in this embodiment, twelve micro switches are provided, and each three groups), and they are symmetrically arranged on the two side walls of the outer frame 21. The outer frame 21 also has a gap for the roller lever action of the micro switch 23.

[0047] Specifically, in this embodiment, the existing small micro switch 23 is replaced by a medium micro switch 23, which increases the travel of the trigger, and the machined outer frame 21 reduces the position tolerance of the assembly, so that the micro switch 23 trigger is more stable, and the lateral distance between the micro switches 23 is increased. Even when the moving contact is closed, the signal output by the micro switch 23 will not change when the trigger block 22 is moved to the maximum position on the left side by the opening shaft 24.

[0048] In some embodiments, the outer frame 21 is provided with a mounting bracket 26 at one end, and the prompt block 25 is rotatably arranged on the mounting bracket 26 through a rotating shaft 27.

[0049] The mounting bracket 26 is also provided with a limiting rod 28 for limiting the prompt block 25.

[0050] A through hole 11 is formed in one side plate of the cabinet 1, and the prompt block 25 is arranged at the through hole 11. The prompt block 25 has a fan-shaped structure, and a double-color rubber sheet is attached to the prompt block 25.

[0051] Specifically, in this embodiment, the prompt block 25 adopts a fan-shaped double-color rotating block structure, the upper half of the rotating block is green, and the lower half is red. The rotating block is fixed on the mounting bracket 26 through the rotating shaft 27. The front end of the opening shaft 24 contacts the lower side of the rear end surface of the prompt block 25. When the opening shaft 24 is extended, the prompt block 25 is rotated upward, and the green color changes to red, which indicates the state of the device. The rear end of the prompt block 25 is provided with a limiting rod 28 to prevent the prompt block 25 from being over-positioned.

[0052] In some embodiments, as shown in Figure 5 The elastic member is a return spring 29, which is sleeved on the opening shaft 24. An inner groove is formed in the opening shaft 24, and a snap spring 210 is arranged in the inner groove to limit the return spring 29.

[0053] Specifically, in this embodiment, the trigger mechanism and the micro switch 23 of the original scheme are integrated together to increase the overall stability of the mechanism. First, the outer frame 21 is changed from a sheet metal part to a metal block directly machined. The medium-sized micro switch 23 is directly fixed to the outer frame 21 with bolts and gaskets. The sheet metal box is changed to a trigger block 22. The trip shaft 24 directly passes through the through hole of the outer frame 21, and the trigger block 22 and the reset spring 29 are connected in series through the retaining spring 210. The head of the trip shaft 24 extends out of the front end of the left side of the outer frame 21, passes through the mounting bracket 26, and the head abuts the side of the prompt block 25. The trip shaft 24 can rotate freely in the hole of the trigger block 22. The trigger block 22 is a non-metallic material with self-lubricating properties and is limited by the side wall of the outer frame 21.

[0054] In some embodiments, as Figure 4 and Figure 5 As shown, the tripping member 3 includes a tripping base 31, an outer sleeve 32, an inner sleeve 33, a tripping spring 34, an embedded part 35, a tripping rod 36 and a tripping end 37;

[0055] The trip base 31 is mounted on a frame support plate (not shown in the drawings), and an arc-shaped groove 39 is formed on one side of the trip base 31. The tail of the inner sleeve 33 is provided with an arc-shaped protrusion 38, which is correspondingly mounted in the arc-shaped groove 39.

[0056] One end of the trip rod 36 is mounted within the outer sleeve 32 via an inner insert 35. The trip spring 34 is sleeved on the trip rod 36 and mounted within the outer sleeve 32 via an inner sleeve 33. The other end of the trip rod 36 passes through the inner sleeve 33 and the arc-shaped groove 39, extends into the chassis 1, and contacts the trip shaft 24. It should be noted that the inner insert 35, the trip end 37, and the outer sleeve 32 are integrally injection-molded, and the end of the trip rod 36 is threadedly connected to the inner insert 35.

[0057] The groove at the bottom of the moving contact is arc-shaped, and the opening terminal 37 is provided with an arc-shaped structure that matches the groove.

[0058] Specifically, in this embodiment, the tripping end 37 (the tripping end 37 is made of metal) is processed into a fan shape, the tripping rod 36 is screwed into the outer sleeve 32, and the inner sleeve 33 is split into the tripping base 31 and the inner sleeve 33. The tripping base 31 is fixed on the frame support plate, and the contact surface with the inner sleeve 33 is processed with an arc groove 39, and an elliptical through hole is processed in the middle of the arc groove 39. When opening and closing the circuit breaker, the tripping rod 36 can swing up and down in the elliptical hole. The tail of the inner sleeve 33 is processed with an arc protrusion 38, which cooperates with the arc groove 39 set on the tripping base and can swing up and down. The middle of the inner sleeve 33 is processed with a circular The through hole is provided with a shaft sleeve to improve the stability of the trip rod 36 during its movement. The trip rod 36 passes through the middle of the shaft sleeve. One end of the trip spring 34 is pressed against the inner side of the outer sleeve 32, and the other end is pressed against the inner side of the inner sleeve 33 to provide a trip repulsive force. The contact surface between the moving contact and the trip end 37 is also processed with an arc groove. When the equipment is opened and closed, the trip component 3 can swing up and down as a whole, eliminating the axial force. The repulsive force value of the trip changes smoothly and linearly, and the hydraulic damping mechanism of the lower buffer is cancelled. In addition, the trip component 3 can be directly installed and disassembled, which increases the stability and maintainability of the equipment and reduces the cost of the equipment.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A DC circuit breaker moving contact opening and closing auxiliary signal mechanism, characterized in that: include: An auxiliary contact member is disposed in the chassis and includes an outer frame, a trigger block, a micro switch, a trip shaft, and a prompt block. The outer frame is fixed in the chassis and has a built-in placement space. The trigger block is installed in the placement space. There are multiple micro switches, which are respectively arranged on both sides of the outer frame. The prompt block is rotatably arranged at one end of the outer frame. An elastic member is arranged between the end of the trigger block close to the prompt block and the outer frame. The opening shaft passes through the outer frame, the trigger block, and the elastic member and contacts the prompt block to drive the prompt block to rotate. The opening member is arranged on the frame support plate, the opening rod of the opening member extends into the outer frame and contacts the opening shaft, and the opening end of the opening member is arranged corresponding to the groove opened at the bottom of the moving contact.

2. The DC circuit breaker moving contact opening and closing auxiliary signal mechanism according to claim 1, characterized in that: The number of the micro switches is four, and they are symmetrically arranged on the outer walls of both sides of the outer frame. A gap is also reserved on the outer frame for the roller lever of the micro switch to move.

3. The DC circuit breaker moving contact opening and closing auxiliary signal mechanism according to claim 1, characterized in that: A mounting bracket is provided at one end of the outer frame, and the prompt block is rotatably mounted on the mounting bracket via a rotating shaft; The mounting bracket is also provided with a limiting rod for limiting the prompt block.

4. The DC circuit breaker moving contact opening and closing auxiliary signal mechanism according to claim 1, characterized in that: A through hole is provided on one side panel of the chassis, and the prompt block is correspondingly arranged at the through hole. The prompt block is in a fan-shaped structure, and a two-color rubber sheet is pasted on it.

5. The DC circuit breaker moving contact opening and closing auxiliary signal mechanism according to claim 1, characterized in that: The elastic member is a reset spring, which is sleeved on the trip shaft. An inner groove is annularly provided on the trip shaft, and a retaining spring is installed in the inner groove for limiting the reset spring.

6. The DC circuit breaker moving contact opening and closing auxiliary signal mechanism according to claim 1, characterized in that: The tripping component includes a tripping base, an outer sleeve, an inner sleeve, a tripping spring, an embedded part, a tripping rod and a tripping end; The switch-off base is arranged on the frame support plate, and an arc-shaped groove is opened on one side of the switch-off base. The tail of the inner sleeve is arranged as an arc-shaped protrusion and is correspondingly arranged in the arc-shaped groove. One end of the trip rod is mounted in the outer sleeve via an embedded component, the trip spring is sleeved on the trip rod and mounted in the outer sleeve via an inner sleeve, and the other end of the trip rod passes through the inner sleeve and the arc-shaped groove, extends into the chassis, and contacts the trip shaft; The opening end contacts a groove provided at the bottom of the moving contact.

7. The DC circuit breaker moving contact opening and closing auxiliary signal mechanism according to claim 6, characterized in that: The groove at the bottom of the moving contact is arranged in an arc shape, and the opening end is provided with an arc structure matching the groove.

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