An electromagnetic instantaneous quick release for frame circuit breaker

Abstract

The present invention discloses an electromagnetic instantaneous quick release for a frame circuit breaker. The release is fixed to an outgoing copper busbar and includes a static iron core, a moving iron core, an adjustment device, and a tripping push rod. The static iron core is a C-shaped cavity component. The moving iron core is fixed to the tripping push rod and disposed at the C-shaped opening of the static iron core. The adjustment device includes a guide shaft, an elastic component, and an adjustment mechanism for adjusting the initial instantaneous operating current value of the elastic component. The elastic component and the adjustment mechanism for adjusting the initial instantaneous operating current value of the elastic component are sleeved on the guide shaft. One end of the tripping push rod is connected to the guide shaft, and the other end is connected to the circuit breaker tripping half-shaft. When the outgoing copper busbar is energized, the static iron core generates a magnetic field that drives the moving iron core, driving one end of the tripping push rod to move, thereby squeezing the spring. The other end of the tripping push rod drives the circuit breaker tripping half-shaft to operate, thereby opening the circuit breaker. The release is purely mechanical and can adjust the instantaneous protection value according to actual needs. It has a simple and compact structure and reliable operation.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit breakers, and in particular relates to an electromagnetic instantaneous quick release for a frame circuit breaker. Background Art

[0002] The frame circuit breaker is a large-capacity switch. As a protective electrical appliance, when a fault current occurs in the circuit, the circuit breaker will perform corresponding protection according to the settings, cut off the circuit, and protect the safety of other electrical equipment and personnel.

[0003] The protective release in the frame circuit breaker triggers protection according to abnormal current or voltage in the circuit, and drives the mechanism to cut off the circuit.

[0004] The vast majority of frame circuit breakers on the market currently use electronic trip devices, which collect data through coil sampling and chip processing, and make judgments based on the settings. When the data meets the set value, a trigger signal is sent to the magnetic flux, causing the circuit breaker mechanism to operate and cut off the fault circuit.

[0005] Although the previous generation of frame circuit breakers also have electromagnetic trip devices, they are similar to molded case circuit breakers, and are completely different from the operating mechanism, contact system and arc extinguishing system of the current frame circuit breakers. The current frame circuit breakers cannot be directly improved and used, and new structures and tripping methods need to be redesigned.

[0006] During the protection process, the electronic trip device has many components, transmission mechanisms, and complex calculations, resulting in long protection time and prone to failure. If the EMC in the operating environment is complex and changeable, malfunctions are prone to occur. The sampling methods of AC and DC electronic protection are also different, requiring the use of different sampling coils. The electronic trip device part requires external power supply. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the present invention provides an electromagnetic instantaneous quick release for a frame circuit breaker, which is a purely mechanical release and can adjust the instantaneous protection value according to actual needs. It has a simple and compact structure and reliable operation.

[0008] The present invention is achieved through the following technical solutions:

[0009] An electromagnetic instantaneous quick release for a frame circuit breaker is fixed on an outgoing copper busbar and comprises a static iron core, a moving iron core, an adjustment device and a trip push rod. The static iron core is a C-shaped cavity component. The moving iron core is fixed on the trip push rod and is arranged at the C-shaped opening of the static iron core. The adjustment device comprises a guide shaft, an elastic component, and an adjustment mechanism for adjusting the initial instantaneous action current value of the elastic component. The elastic component and the adjustment mechanism for adjusting the initial instantaneous action current value of the elastic component are sleeved on the guide shaft. One end of the trip push rod is connected to the guide shaft, and the other end is connected to the circuit breaker trip half shaft. When the outgoing copper busbar is energized, the static iron core generates a magnetic field that drives the moving iron core to drive one end of the trip push rod to move, thereby squeezing the spring. The other end of the trip push rod drives the circuit breaker trip half shaft to operate, and the circuit breaker is opened.

[0010] Furthermore, the elastic component is a spring, and the adjustment mechanism for adjusting the initial instantaneous action current value of the elastic component is a spring clamp and an adjustment knob. The spring and spring clamp are sleeved on the guide shaft, and the adjustment knob is connected to the spring clamp. Adjusting the adjustment knob drives the spring clamp to move, and the spring clamp pushes the spring to adjust the initial instantaneous action current value.

[0011] Furthermore, the static iron core includes a magnetic conductive sheet, and clamping plates are provided at the front and rear of the magnetic conductive sheet, and the magnetic conductive sheet is clamped and fixed by the clamping plates.

[0012] Furthermore, a left baffle and a right baffle are provided on the left and right sides of the C-shaped opening of the static iron core. Both the left baffle and the right baffle are provided with push rod holes for the release push rod to pass through. The left baffle, the right baffle and the clamping plates on the front and rear sides together form the activity space of the moving iron core.

[0013] Furthermore, the width of the clamping plate at the C-shaped opening is greater than the thickness of the magnetic conductive sheet.

[0014] Furthermore, the clamping plate is provided with a clearance hole at the C-shaped opening of the static iron core.

[0015] Furthermore, the adjustment device is laterally arranged on the opposite side of the C-shaped opening in the middle of the static iron core cavity.

[0016] Furthermore, the adjustment device also includes a first fixing member and a second fixing member, the second fixing member is in a straight line shape, and a slot is provided in the middle, and the second fixing member is horizontally clamped on the static iron core through the slot, and the first fixing member is in a U-shape, including a U-shaped opening and a bottom, the U-shaped opening is clamped at the upper and lower ends of the second fixing member, and the bottom fixes the guide shaft.

[0017] Furthermore, the adjusting knob is symmetrically arranged on the front and rear sides of the static iron core, the adjusting knob passes through the second fixing piece, and the end of the adjusting knob is connected to the spring seat.

[0018] Furthermore, the guide shaft is arranged horizontally, and a protrusion is provided at the end.

[0019] Beneficial effects of the present invention:

[0020] The invention discloses an electromagnetic instantaneous quick release for a frame circuit breaker. The release is purely mechanical, can adjust the instantaneous protection value according to actual needs, and has a simple and compact structure and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the static iron core of the present invention;

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the movable iron core and the trip push rod of the present invention;

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the regulating device of the present invention;

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the regulating device of the present invention;

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the present invention;

[0027] Wherein: 1, static iron core; 101, magnetic conductive sheet; 102, clamping plate; 103, rivet; 104, left baffle; 105, right baffle;

[0028] 2. Moving iron core; 3. Adjustment device; 301. Guide shaft; 302. Spring; 303. Spring holder; 304. Adjustment knob; 305. First fixing piece; 306. Second fixing piece; 4. Tripping push rod; 5. Copper busbar fixing device; 6. Outgoing copper busbar; 7. Circuit breaker tripping half shaft. DETAILED DESCRIPTION

[0029] The preferred mechanism and motion realization method of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] It should be noted that the orientations or positional relationships indicated by terms such as "width", "height", "longitudinal", "front end", "rear end", "bottom end", "two ends", "one side", and "the other side" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0031] like Figure 1-6 As shown, an electromagnetic instantaneous fast release for a frame circuit breaker includes a static iron core 1, a moving iron core 2, an adjusting device 3, a tripping push rod 4 and a fixing device 5.

[0032] For the convenience of description, it is now stipulated that Figure 1 For example, the length direction of the static iron core 1 is the left and right sides, the side where the trip push rod 4 is set is the left side, the side where the adjustment device 3 is set is the right side, and the direction where the outgoing copper bar 6 is set is the front and back sides. Figure 1 For example, the upper left side is the front side and the lower right side is the rear side.

[0033] like Figure 2 As shown, the static iron core 1 is composed of a magnetic conductive sheet 101 having a C-shaped cavity component. The magnetic conductive sheet 101 is a silicon steel sheet, and clamping plates 102 are set at the front and back, and then fixed by rivets 103.

[0034] As shown in Figures 4, 5 and 6, the adjustment device 3 is horizontally arranged on the right side of the middle part of the cavity of the static iron core 1, and includes a guide shaft 301, a spring 302, a spring seat 303, an adjustment knob 304, a first fixing member 305 and a second fixing member 306.

[0035] The first fixing member 305 and the second fixing member 306 are combined to jointly fix the adjustment device 3 on the right side of the middle part of the static iron core 1. The second fixing member 306 is in a straight line shape, with a slot in the middle, and is horizontally clamped on the inner side of the static iron core 1; the first fixing member 305 is in a U-shape, including a U-shaped opening and a bottom, and its opening is clamped at the upper and lower ends of the second fixing member 306. The guide shaft 301 is horizontally arranged, one end of which is movably arranged at the bottom of the U shape, and the other end is provided with a protrusion for supporting the tripping push rod 4 and serving as a clamping position for the spring 302. The spring 302 and the spring clamp 303 are mounted on the guide shaft 301, and the two ends of the spring are respectively limited by the protrusion of the guide shaft 301 and its spring clamp 303. The adjusting knob 304 passes through the second fixing member 306, and its end is fixed to the spring holder 303. The adjusting knob 304 includes two, which are respectively arranged on both sides of the second fixing member 306, and also on the front and back sides of the static iron core 1. The adjusting knob 304 can be adjusted according to the design or actual needs to drive the spring holder 303 to move, thereby changing the initial compression amount of the spring 302, changing the elastic force, and changing the size of the thrust that pushes the guide shaft 301 to move horizontally, thereby adjusting the operating current value of the moving iron core 2.

[0036] The functions of the spring here are: first, to give the moving iron core 2 initial pressure to control the short-circuit current value. When the short-circuit current exceeds the set value, the magnetic force generated by the static iron core 1 is greater than the elastic force of the spring 302 to push the moving iron core 2 to the right. Second, it gives the moving iron core 2 a push to reset after the circuit breaker is opened.

[0037] like Figure 3 、 6 As shown, the moving iron core 2 is arranged on the trip push rod 4, one end of the trip push rod 4 is against the guide shaft 301 of the adjustment device 3, and the other end is connected to the circuit breaker trip half shaft 7.

[0038] The moving iron core 2 is positioned within the C-shaped opening of the stationary iron core 1 and can move back and forth and left and right along the length of the stationary iron core 1. The C-shaped opening of the stationary iron core is flanked by rectangular plates 102, whose width at the C-shaped opening is greater than the thickness of the magnetic conductive sheet 101. Plates 102 are provided with clearance holes within the C-shaped opening to accommodate the screws and nuts securing the moving iron core 2. A left baffle 104 and a right baffle 105 are provided on either side of the C-shaped opening, respectively. Both plates are provided with push rod holes to facilitate the passage of the release push rod 4. Thus, the left baffle 104, right baffle 105, and the front and rear plates 102 together enclose the movable space of the moving iron core 2.

[0039] The copper bar fixture 5 is L-shaped, with one side fixed to the stationary iron core 1 and the other to the outgoing copper bar 6. This fixture is used to secure the trip unit to the outgoing copper bar 6. The outgoing copper bar 6 passes through the stationary iron core 1 from the top and bottom of the guide shaft 301. Each outgoing copper bar 6 is secured by two copper bar fixtures 5 located on the front and rear sides of the stationary iron core 1. The stationary iron core 1 senses the current in the outgoing copper bar 6, forming a magnetic circuit, thereby applying electromagnetic attraction to the moving iron core 2.

[0040] The regulating device 3 is a device for adjusting the initial force value of the spring, which can adjust the instantaneous action current value.

[0041] The working process of the release is:

[0042] First, the initial value of the spring 302 is set by adjusting the adjustment knob 304 .

[0043] During operation, when a short-circuit current flows through the outgoing copper busbar 6, the static iron core 1 generates a magnetic field corresponding to the main circuit current. When the main circuit current exceeds the set value, the electromagnetic force generated by the static iron core 1 drives the movable iron core 2 to the right, and the push guide shaft 301 of the trip push rod 4 compresses the spring 302 to the right. This drives the circuit breaker trip half shaft 7, thereby opening the circuit breaker and interrupting the main circuit fault current. After the circuit breaker is opened, no current flows through the outgoing copper busbar 6, and the magnetic field of the static iron core 1 disappears. The spring 302 pushes the guide shaft 301 to the left, causing the movable iron core 2 and the trip push rod 4 to reset. The trip push rod 4 then resets the circuit breaker trip half shaft 7.

[0044] The present invention is a purely mechanical tripping device with a simple and compact structure, universal AC and DC operation, and no external power supply required. It can effectively increase the breaking speed, reduce the breaking time, limit the breaking current value, and enhance the breaking capacity of the circuit breaker.

[0045] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. However, 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. An electromagnetic instantaneous quick release for a frame circuit breaker, fixed on an outlet copper busbar (6), characterized in that: The invention comprises a static iron core (1), a movable iron core (2), an adjusting device (3) and a tripping push rod (4), wherein the static iron core (1) is a C-shaped cavity component, the movable iron core is fixed on the tripping push rod (4) and is arranged at the C-shaped opening of the static iron core (1), the adjusting device (3) comprises a guide shaft (301), an elastic component, and an adjusting mechanism for adjusting the initial instantaneous action current value of the elastic component, the elastic component and the adjusting mechanism for adjusting the initial instantaneous action current value of the elastic component are sleeved on the guide shaft (301), one end of the tripping push rod (4) is connected to the guide shaft (301), and the other end is connected to the circuit breaker tripping half shaft (7); When the outgoing copper busbar (6) is energized, the static iron core (1) generates a magnetic field to push the dynamic iron core (2) to drive one end of the trip push rod (4) to move, thereby squeezing the spring (302), and the other end of the trip push rod (4) drives the circuit breaker trip half shaft (7) to move, and the circuit breaker is opened; The elastic component is a spring (302), and the adjustment mechanism for adjusting the initial instantaneous action current value of the elastic component is a spring clamp (303) and an adjustment knob (304). The spring (302) and the spring clamp (303) are sleeved on the guide shaft (301), and the adjustment knob (304) is connected to the spring clamp (303). Adjusting the adjustment knob (304) drives the spring clamp to move, and the spring clamp (303) pushes the spring (302) to adjust the initial instantaneous action current value. The static iron core (1) comprises a magnetic conductive sheet (101), and clamping plates (102) are provided at the front and rear of the magnetic conductive sheet (101), and the magnetic conductive sheet (101) is clamped and fixed by the clamping plates (102).

2. The electromagnetic instantaneous quick release for a frame circuit breaker according to claim 1, characterized in that: A left baffle (104) and a right baffle (105) are provided on the left and right sides of the C-shaped opening of the static iron core (1). Both the left baffle (104) and the right baffle (105) are provided with push rod holes for facilitating the passage of the trip push rod (4). The left baffle (104), the right baffle (105) and the clamping plates (102) on the front and rear sides together form an activity space for the moving iron core (2).

3. The electromagnetic instantaneous quick release for a frame circuit breaker according to claim 2, characterized in that: The width of the clamping plate (102) at the C-shaped opening is greater than the thickness of the magnetic conductive sheet (101).

4. The electromagnetic instantaneous quick release for a frame circuit breaker according to claim 1, characterized in that: The clamping plate (102) is provided with a clearance hole at the C-shaped opening of the static iron core (1).

5. The electromagnetic instantaneous quick release for a frame circuit breaker according to claim 1, characterized in that: The regulating device (3) is arranged transversely on the opposite side of the C-shaped opening in the middle of the cavity of the static iron core (1).

6. The electromagnetic instantaneous quick release for a frame circuit breaker according to claim 5, characterized in that: The adjusting device (3) further comprises a first fixing member (305) and a second fixing member (306), wherein the second fixing member (306) is in a straight line shape and has a slot in the middle thereof, and the second fixing member (306) is horizontally clamped on the static iron core (1) through the slot, and the first fixing member (305) is in a U-shape, comprising a U-shaped opening and a bottom, wherein the U-shaped opening is clamped at the upper and lower ends of the second fixing member (306), and the bottom fixes the guide shaft (301).

7. The electromagnetic instantaneous quick release for a frame circuit breaker according to claim 5, characterized in that: The adjusting knob (304) is symmetrically arranged on the front and rear sides of the static iron core (1), the adjusting knob (304) passes through the second fixing member (306), and the end of the adjusting knob (304) is connected to the spring clamping seat (303).

8. The electromagnetic instantaneous quick release for a frame circuit breaker according to claim 6, characterized in that: The guide shaft (301) is arranged horizontally, and a protrusion is provided at the end.

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