Molded case circuit breaker

Abstract

The utility model provides a molded case circuit breaker, which relates to the field of circuit breakers, and comprises a circuit breaker shell, a contact system and an arc extinguishing system arranged in the circuit breaker shell, the contact system is connected with the arc extinguishing system, an installation seat is arranged outside the circuit breaker shell, the circuit breaker shell is clamped with the installation seat through a buckle, and the buckle is connected with the installation seat. A supporting assembly used for supporting the circuit breaker shell is further arranged at the bottom of the mounting base and comprises an adjusting rod and a split type detachable elastic clamping piece, the two ends of the elastic clamping piece are fixedly connected with the circuit breaker shell and the adjusting rod respectively, and the other end of the adjusting rod penetrates through the bottom of the mounting base and is in threaded fit with an adjusting cap. A gap is formed between the outer surface of the adjusting rod and the inner wall of the mounting base, the adjusting rod is clamped in the elastic clamping piece, then the adjusting cap is rotated to be attached to the bottom wall of the mounting base, at the moment, the adjusting rod does not move any more, the circuit breaker shell is fixedly supported, the supporting effect of the circuit breaker shell is further improved, and the situation that the circuit breaker is loosened due to impact is prevented.

Description

Technical Field

[0001] The utility model relates to the field of circuit breakers, in particular to a molded case circuit breaker. Background Art

[0002] Molded case circuit breaker is a commonly used protective device. It has the functions of switching on and off load current and protecting load current from overload and short circuit. It is widely used in various power distribution systems and motor overload and short circuit protection.

[0003] In actual applications, the molded case circuit breaker includes a circuit breaker housing, a contact system and an arc extinguishing system. Specifically, a magnetic conductive sheet is arranged under the static contact in the contact system. When the moving and static contacts are closed or disconnected, the Lorentz force quickly pulls the arc into the arc extinguishing chamber of the arc extinguishing system above, and the long arc is quickly divided into short arcs by the arc extinguishing grids, thereby achieving the purpose of extinguishing the arc. During actual installation, the circuit breaker housing will be snapped onto the mounting base by means of a buckle, and part of the structure in the circuit breaker housing will be suspended in the air for easy maintenance. When the circuit breaker housing is collided, the mounting base supporting the circuit breaker housing and the static contact of the arc extinguishing system are easy to loosen, causing the circuit breaker to loosen as a whole.

[0004] Therefore, it is necessary to provide a new molded case circuit breaker to solve the above technical problems. Utility Model Content

[0005] In order to solve the technical problem that when the circuit breaker housing is hit, the mounting base supporting the circuit breaker housing and the static contact piece of the arc extinguishing system are easily loosened, causing the circuit breaker to loosen as a whole and making the arc extinguishing system prone to failure, the utility model provides a molded case circuit breaker.

[0006] The molded case circuit breaker provided by the utility model comprises a circuit breaker housing, a contact system and an arc extinguishing system installed in the circuit breaker housing, the contact system is connected to the arc extinguishing system, a mounting seat is further provided on the outside of the circuit breaker housing, the circuit breaker housing and the mounting seat are engaged with each other through a buckle, and a supporting assembly for supporting the circuit breaker housing is further provided at the bottom of the mounting seat;

[0007] The support assembly includes an adjusting rod and a split-type detachable elastic clip, the two ends of the elastic clip are respectively fixedly connected to the circuit breaker housing and the adjusting rod, the other end of the adjusting rod passes through the bottom of the mounting seat and is threadedly fitted with an adjusting cap, and there is a gap between the outer surface of the adjusting rod and the inner wall of the mounting seat.

[0008] Furthermore, the elastic clamp includes a driving head, a connecting tube and an elastic telescopic part located inside the connecting tube, the driving head is fixedly connected to one end of the adjusting rod, the other end of the driving head penetrates into the connecting tube and fits with the elastic telescopic part, and a positioning column is provided on the outer surface of the driving head, an arc groove is provided on the outer surface of the connecting tube for the positioning column to slide, and the bottom of the arc groove is also connected to a barb-shaped fixing groove, and a connecting plate is fixed to the outer surface of the connecting tube, and the connecting plate is fixedly connected to the outer side of the circuit breaker housing.

[0009] Furthermore, the connecting tube includes a mounting sleeve and a connecting sleeve, the mounting sleeve is threadedly matched with the connecting sleeve, the outer side of the mounting sleeve is fixedly connected to the connecting plate, and the arc groove is opened on the connecting sleeve.

[0010] Furthermore, the elastic telescopic part includes a pressure block, a spring and a movable rod, one end of the pressure block is fitted with the driving head, the other end of the pressure block is fixedly connected to the movable rod, the spring is sleeved on the outer surface of the movable rod, the two ends of the spring are respectively fitted with the bottom wall of the inner cavity of the connecting sleeve of the pressure block, and the end of the movable rod away from the pressure block passes through the connecting sleeve.

[0011] Furthermore, a connecting groove for the contact system to pass through is provided on the outer side of the mounting seat.

[0012] Furthermore, the outer surface of the adjusting cap is also provided with anti-slip grooves.

[0013] Furthermore, a plurality of lead frames are equidistantly arranged on the top of the mounting seat, the lead frames correspond to the connection terminal positions of the circuit breaker housing, a wire clamp plate for fixing cables is arranged inside the lead frame, and an identification block for identifying the power supply line is arranged on the top of the lead frame.

[0014] Compared with the related art, the molded case circuit breaker provided by the utility model has the following beneficial effects:

[0015] First, the adjusting rod can be connected to the circuit breaker housing through an elastic clip, the adjusting rod is clamped in the elastic clip, and then the adjusting cap is rotated to make it fit against the bottom wall of the mounting base. At this time, the adjusting rod is no longer active, completing the fixed support for the circuit breaker housing, further improving the support effect of the circuit breaker housing, and preventing the circuit breaker from loosening due to impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The overall structure diagram of the molded case circuit breaker provided by the utility model Figure 1 ;

[0017] Figure 2 The overall structure diagram of the molded case circuit breaker provided by the utility model Figure 2 ;

[0018] Figure 3 The structure diagram of the support assembly provided by the utility model Figure 1 ;

[0019] Figure 4 The structure diagram of the support assembly provided by the utility model Figure 2 ;

[0020] Figure 5 The structure diagram of the support assembly provided by the utility model Figure 3 ;

[0021] Figure 6 This is a schematic structural diagram of the lead frame provided by the utility model.

[0022] Numbers in the figure: 1. Circuit breaker housing; 2. Contact system; 3. Mounting seat; 4. Adjusting rod; 5. Adjusting cap; 6. Driving head; 7. Positioning column; 8. Arc groove; 9. Fixing groove; 10. Connecting plate; 11. Mounting sleeve; 12. Connecting sleeve; 13. Pressing block; 14. Spring; 15. Movable rod; 16. Connecting groove; 17. Lead frame; 18. Wire clamp; 19. Identification block. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0024] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 as well as Figure 6 ,in, Figure 1 The overall structure diagram of the molded case circuit breaker provided by the utility model Figure 1 ; Figure 2 The overall structure diagram of the molded case circuit breaker provided by the utility model Figure 2 ; Figure 3 The structure diagram of the support assembly provided by the utility model Figure 1 ; Figure 4 The structure diagram of the support assembly provided by the utility model Figure 2 ; Figure 5 The structure diagram of the support assembly provided by the utility model Figure 3 ; Figure 6 This is a schematic structural diagram of the lead frame provided by the utility model.

[0025] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the specific implementation process, Figure 1-Figure 5 As shown, the molded case circuit breaker includes a circuit breaker housing 1, a contact system 2 and an arc extinguishing system installed in the circuit breaker housing 1, the contact system 2 is connected to the arc extinguishing system, a connecting groove 16 for the contact system 2 to pass through is provided on the outside of the mounting seat 3, a mounting seat 3 is further provided on the outside of the circuit breaker housing 1, the circuit breaker housing 1 and the mounting seat 3 are snap-fitted, and a supporting assembly for supporting the circuit breaker housing 1 is further provided at the bottom of the mounting seat 3;

[0027] It should be noted that the arc extinguishing system and the contact system 2, as mentioned in the background technology, adopt the traditional magnetic blowout arc extinguishing technology, in which the arc is elongated and its diffusion is accelerated by the magnetic field force, thereby achieving arc extinguishing. This technology is often used in large-scale high-voltage switchgear, so it will not be described in detail here;

[0028] The support assembly includes an adjusting rod 4 and a split and detachable elastic clamp, the two ends of the elastic clamp are respectively fixedly connected to the circuit breaker housing 1 and the adjusting rod 4, the other end of the adjusting rod 4 passes through the bottom of the mounting seat 3 and is threadedly matched with an adjusting cap 5, the outer surface of the adjusting cap 5 is also provided with anti-slip grooves, and there is a gap between the outer surface of the adjusting rod 4 and the inner wall of the mounting seat. First, the adjusting rod 4 can be connected to the circuit breaker housing 1 through the elastic clamp, the adjusting rod 4 is clamped in the elastic clamp, and then the adjusting cap 5 is rotated to make it fit on the bottom wall of the mounting seat 3. At this time, the adjusting rod 4 is no longer active, and the fixed support for the circuit breaker housing 1 is completed, thereby further improving the supporting effect of the circuit breaker housing 1 and preventing the circuit breaker from being loosened due to impact;

[0029] The elastic clamp includes a driving head 6, a connecting tube and an elastic telescopic member located inside the connecting tube. The driving head 6 is fixedly connected to one end of the adjusting rod 4, and the other end of the driving head 6 penetrates into the connecting tube and fits with the elastic telescopic member. A positioning column 7 is provided on the outer surface of the driving head 6. An arc groove 8 is provided on the outer surface of the connecting tube for the positioning column 7 to slide, and the bottom of the arc groove 8 is also connected with a barb-shaped fixing groove 9. A connecting plate 10 is fixed to the outer surface of the connecting tube. The connecting plate 10 is fixedly connected to the outer side of the circuit breaker housing 1. The connecting tube includes a mounting sleeve 11 and a connecting sleeve 12. The mounting sleeve 11 is threadedly matched with the connecting sleeve 12. The outer side of the mounting sleeve 11 is fixedly connected to the connecting plate 10. The arc groove 8 is provided on the connecting sleeve 12. One end of the driving head 6 is inserted into the connecting sleeve 12 and the positioning column 7 moves along the direction of the arc groove 8. At this time, the driving head 6 squeezes the elastic telescopic member to shrink. When the positioning column 7 moves to the bottom of the arc groove 8, the positioning column 7 is driven by the elastic force of the elastic telescopic member to be stuck in the fixing groove 9, thereby completing the clamping installation of the driving head 6.

[0030] The elastic telescopic part includes a pressure block 13, a spring 14 and a movable rod 15. One end of the pressure block 13 is in contact with the driving head 6, and the other end of the pressure block 13 is fixedly connected to the movable rod 15. The spring 14 is sleeved on the outer surface of the movable rod 15, and the two ends of the spring 14 are respectively in contact with the bottom wall of the inner cavity of the connecting sleeve 12 of the pressure block 13. The end of the movable rod 15 away from the pressure block 13 passes through the connecting sleeve 12, and the driving head 6 squeezes the pressure block 13. When the pressure block 13 is squeezed, the spring 14 is compressed, and the movable rod 15 passes through the bottom of the connecting sleeve 12. On the contrary, the rebound force of the spring 14 drives the pressure block 13 to reset.

[0031] refer to Figure 6 As shown, a plurality of lead frames 17 are equidistantly arranged on the top of the mounting base 3, the lead frames 17 correspond to the terminal positions of the circuit breaker housing 1, a wire clamp plate 18 for fixing cables is arranged inside the lead frame 17, and an identification block 19 for identifying the power supply line is arranged on the top of the lead frame 17, and the wire clamp plate 18 can facilitate the fixing of the connecting cables.

[0032] The working principle of the utility model is as follows: first, the adjusting rod 4 can be connected to the circuit breaker housing 1 through an elastic clamp, the adjusting rod 4 is clamped in the elastic clamp, and then the adjusting cap 5 is rotated to make it fit on the bottom wall of the mounting seat 3. At this time, the adjusting rod 4 is no longer movable, and the fixed support for the circuit breaker housing 1 is completed, further improving the supporting effect of the circuit breaker housing 1, and preventing the circuit breaker from being loosened due to impact;

[0033] The engagement and disassembly method of the elastic clamp is that one end of the drive head 6 is inserted into the connecting sleeve 12 and the positioning column 7 moves along the direction of the arc groove 8. At this time, the drive head 6 squeezes the elastic telescopic part to shrink. When the positioning column 7 moves to the bottom of the arc groove 8, the elastic force of the elastic telescopic part drives the positioning column 7 to be stuck in the fixed groove 9, completing the engagement and installation of the drive head 6, and screwing the adjusting cap 5 to make it fit the bottom wall of the mounting seat 3. At this time, the adjusting rod 4 is no longer active. On the contrary, when disassembling, first screw the adjusting cap 5 to leave a gap between it and the bottom wall of the mounting seat 3, and push the adjusting rod 4 to make the drive head 6 squeeze the elastic telescopic part to shrink. The positioning column 7 is moved out of the fixed groove 9 and rotated and reset along the arc groove 8 under the push of the elastic telescopic part, and the drive head 6 can be taken out.

[0034] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0035] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0036] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A molded case circuit breaker, comprising a circuit breaker housing (1), a contact system (2), and an arc extinguishing system installed in the circuit breaker housing (1), wherein the contact system (2) is connected to the arc extinguishing system, and a mounting seat (3) is further provided on the outside of the circuit breaker housing (1), wherein the circuit breaker housing (1) and the mounting seat (3) are engaged with each other by means of a snap fastener. It is characterized in that A supporting assembly for supporting the circuit breaker housing (1) is also provided at the bottom of the mounting seat (3); The support assembly comprises an adjustment rod (4) and a split detachable elastic clamp, the two ends of the elastic clamp are respectively fixedly connected to the circuit breaker housing (1) and the adjustment rod (4), the other end of the adjustment rod (4) passes through the bottom of the mounting seat (3) and is threadedly fitted with an adjustment cap (5), and a gap is provided between the outer surface of the adjustment rod (4) and the inner wall of the mounting seat (3).

2. The molded case circuit breaker according to claim 1, It is characterized in that The elastic clamp comprises a driving head (6), a connecting tube and an elastic telescopic member located inside the connecting tube, the driving head (6) being fixedly connected to one end of the adjusting rod (4), the other end of the driving head (6) being inserted into the connecting tube and being fitted with the elastic telescopic member, and a positioning column (7) being provided on the outer surface of the driving head (6), an arc-shaped groove (8) for sliding of the positioning column (7) being provided on the outer surface of the connecting tube, and a barbed fixing groove (9) being connected at the bottom of the arc-shaped groove (8), and a connecting plate (10) being fixedly connected to the outer side of the circuit breaker housing (1).

3. The molded case circuit breaker according to claim 2, It is characterized in that The connecting tube comprises a mounting sleeve (11) and a connecting sleeve (12), the mounting sleeve (11) and the connecting sleeve (12) being threadedly matched, the outer side of the mounting sleeve (11) being fixedly connected to the connecting plate (10), and the arc groove (8) being provided on the connecting sleeve (12).

4. The molded case circuit breaker according to claim 3, It is characterized in that The elastic telescopic component comprises a pressure block (13), a spring (14) and a movable rod (15); one end of the pressure block (13) is in contact with the driving head (6); the other end of the pressure block (13) is fixedly connected to the movable rod (15); the spring (14) is sleeved on the outer surface of the movable rod (15); the two ends of the spring (14) are respectively in contact with the bottom wall of the inner cavity of the connecting sleeve (12) of the pressure block (13); and the end of the movable rod (15) away from the pressure block (13) passes through the connecting sleeve (12).

5. The molded case circuit breaker according to claim 4, It is characterized in that The outer side of the mounting seat (3) is provided with a connecting groove (16) for the contact system (2) to pass through.

6. The molded case circuit breaker according to claim 5, It is characterized in that The outer surface of the adjusting cap (5) is also provided with anti-slip grooves.

7. The molded case circuit breaker according to claim 6, It is characterized in that A plurality of lead frames (17) are equidistantly arranged on the top of the mounting seat (3); the lead frames (17) correspond to the connection terminal positions of the circuit breaker housing (1); a wire clamp plate (18) for fixing cables is arranged inside the lead frame (17); and an identification block (19) for identifying a power supply line is arranged on the top of the lead frame (17).

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