Multi-hook instantaneous adjusting mechanism

Abstract

A multi-hook instantaneous adjusting mechanism comprises a knob which is arranged on the surface of a molded case circuit breaker, and the lower end of the knob is provided with an inclined plane which is arranged along the rotation direction of the knob; the draw bar is rotatably arranged in the molded case circuit breaker, one side of the draw bar is provided with a plurality of hooking parts used for hanging an instantaneous tension spring, the other side of the draw bar is provided with an extension part, the extension part extends to the lower part of the knob, the extension part is provided with a matching part matched with the inclined surface, and the inclined surface is provided with an inclined surface; the hooking part is provided with at least two hooks used for adjusting the tension of the instantaneous tension spring along the axis of the hooking part and a traction rod changed into a plurality of hooks, the tension of the instantaneous tension spring is further adjusted by utilizing the change of the hanging position of the instantaneous tension spring, and the hooking position of the instantaneous tension spring can be adjusted according to the specification of the required instantaneous current; the complexity that instant tension springs of different specifications need to be prepared during factory verification in the past is omitted, meanwhile, compared with spring replacement, the hooking position of the instant tension spring is more convenient to adjust, and verification efficiency is greatly improved.

Description

Technical Field

[0001] The utility model specifically relates to a multi-hook instantaneous adjustment mechanism. Background Art

[0002] When the circuit breaker is in operation, the current will flow through the thermomagnetic element and the connecting plate. When a large fault current (several times the rated current) appears in the line, a large magnetic field will be generated around the element, causing the yoke to generate a large magnetic force. When the magnetic force can overcome external resistance (such as spring reaction force), the yoke will attract the armature, and the armature will drive the traction rod to rotate, causing the circuit breaker to trip and cut off the power immediately, thus protecting the line.

[0003] The instantaneous effectiveness of existing molded case circuit breakers with different current specifications is achieved by adjusting the instantaneous knob to drive the adjusting rod to flip up and down, thereby stretching the tension spring hung on the adjusting rod to achieve the required instantaneous effectiveness requirements. For example, Chinese patent CN207834231U discloses a thermal magnetic protection system for a molded case circuit breaker, which discloses that the second traction rod 7 can be rotated when the first knob is rotated, and the rotation of the second traction rod can pull the instantaneous tension spring to change the elastic force of the instantaneous tension spring, so that the circuit breaker can be disconnected under different multiples of short-circuit current, thereby realizing magnetic adjustment.

[0004] However, during the factory instantaneous calibration, the instantaneous validation requirements of different current specifications need to be met. The elastic force range adjusted by the first knob alone cannot meet the current specification requirements of the factory instantaneous calibration. That is, a single tension spring cannot meet the instantaneous validation requirements of different current specifications at the same time. Multiple tension springs need to be replaced to meet the requirements, which makes the production process complicated and prone to errors, affecting product quality. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model aims to provide a multi-hook instantaneous adjustment mechanism.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A multi-hook instantaneous adjustment mechanism, comprising:

[0008] The knob is arranged on the surface of the molded case circuit breaker, and the lower end thereof is provided with an inclined surface arranged along the rotation direction of the knob;

[0009] The traction rod is rotatably arranged inside the molded case circuit breaker, and one side of the traction rod is provided with a plurality of hooking parts for hanging the instantaneous tension spring, and the other side of the traction rod is provided with an extension part, the extension part extends to the bottom of the knob, the extension part is provided with a matching part for matching with the inclined surface, and the hooking part is provided with at least two hooks for adjusting the tension of the instantaneous tension spring along the axis of the hooking part.

[0010] When the knob is rotated, the traction rod can be rotated, and the rotation of the traction rod can pull the instantaneous tension spring to stretch so as to change the elastic force of the instantaneous tension spring, thereby enabling the molded case circuit breaker to be disconnected under short-circuit currents of different multiples.

[0011] It also includes a support frame, which is fixedly connected to the molded case circuit breaker base and has U-shaped grooves on both sides for carrying a traction rod.

[0012] The surface of the support frame is provided with a table surface which can support and fix the knob. The knob part passes through the table surface and enters into the interior of the molded case circuit breaker and cooperates with the matching part of the traction rod.

[0013] The table top is provided with a limit block for limiting the maximum rotation angle of the knob, and the knob is provided with a protrusion that forms a limit fit with the limit block.

[0014] The portion where the traction rod cooperates with the U-shaped groove is in an arc shape.

[0015] The matching portion is a convex point, and its surface is spherical.

[0016] An annular columnar structure is disposed at the lower end of the knob, and the inclined surface is arranged along the circumference of the annular columnar structure.

[0017] The beneficial effects of the utility model are as follows: on the basis of the existing instantaneous adjustment mechanism, the original single-hook traction rod is changed into a plurality of hook traction rods, and the position change of the instantaneous tension spring is utilized to further realize the tension adjustment of the instantaneous tension spring, and the hooking position of the instantaneous tension spring can be adjusted according to the size of the required instantaneous current to meet the needs, thereby eliminating the tediousness of preparing instantaneous tension springs of different specifications during instantaneous calibration. At the same time, compared with replacing the spring, adjusting the hooking position of the instantaneous tension spring is more convenient, and there is no need to disassemble and assemble the circuit breaker, thereby improving the calibration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of a molded case circuit breaker.

[0019] Figure 2 It is a partial schematic diagram of the utility model located inside the molded case circuit breaker.

[0020] Figure 3 It is a schematic diagram of the structure of the thermal release.

[0021] Figure 4 It is a structural schematic diagram of the utility model.

[0022] Figure 5 A schematic diagram of the structure of the support frame.

[0023] Figure 6 A schematic diagram of the structure of the traction rod.

[0024] Figure 7 A schematic diagram of the structure of the knob. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] As shown in the figure, a multi-hook instantaneous adjustment mechanism includes:

[0028] The knob 4 is arranged on the surface of the molded case circuit breaker 1, and a slope 41 is arranged along the rotation direction of the knob at its lower end. The operating surface of the knob is exposed on the surface of the molded case circuit breaker, which is convenient for manually adjusting the rotation position of the knob to achieve adjustment of the instantaneous tension spring tension;

[0029] The traction rod 2 is rotatably arranged inside the molded case circuit breaker, and one side of the traction rod is provided with a plurality of hooking parts 21 for hanging the instantaneous tension spring, and the other side of the traction rod is provided with an extension part 22, the extension part extends to the bottom of the knob, and the extension part is provided with a matching part 221 matching with the inclined surface, and the hooking part 21 is provided with at least two hooks 211 for adjusting the tension of the instantaneous tension spring along the axis of the hooking part, and the height of each hook 211 varies. By providing multiple hooks, the fixing level of the instantaneous tension spring is changed, and then the elastic force of the instantaneous tension spring is changed to adapt to the requirements of the instantaneous tension spring of different specifications of current in the factory verification test.

[0030] When the knob is rotated, the traction rod can be rotated, and the rotation of the traction rod can pull the instantaneous tension spring to stretch so as to change the elastic force of the instantaneous tension spring, thereby enabling the circuit breaker to be disconnected under short-circuit currents of different multiples.

[0031] It also includes a support frame 3, which is fixedly connected to the molded case circuit breaker base, and U-shaped grooves 33 for carrying the traction rod are provided on both sides of the support frame. The support frame is fixedly connected to the molded case circuit breaker base by screws, and plays a role in supporting the instantaneous adjustment mechanism. The U-shaped groove opening is set upward, and the support effect on the traction rod can be achieved by simply placing the two ends of the traction rod in the U-shaped groove. At the same time, due to the design of the arc-shaped contact surface of the U-shaped groove, the traction rod can be rotated when one side is subjected to force and the other side is restricted by the instantaneous tension spring, thereby changing the tensile state of the instantaneous tension spring, and then adjusting the tension of the instantaneous tension spring.

[0032] The surface of the support frame is provided with a table 32 that can support and fix the knob. The knob part passes through the table into the interior of the molded case circuit breaker and cooperates with the matching part of the traction rod. The table is arranged parallel to the upper surface of the U-shaped groove, and the table is embedded in the top cover of the molded case circuit breaker body, so that the knob is placed on the surface, which is more convenient for the user to operate the knob.

[0033] Preferably, a scale is set on the table surface. The scale can be directly etched on the table surface, or a scale plate can be set. The selection is made according to the needs, and an arrow is set on the knob to understand the current tension.

[0034] The table top is provided with a limit block 31 for limiting the maximum rotation angle of the knob, and the knob is provided with a protrusion that forms a limit fit with the limit block. By setting the limit block and the protrusion that cooperates with it, excessive rotation of the knob is limited, which may cause damage to the traction rod or instantaneous falling off of the tension spring.

[0035] The portion where the traction rod cooperates with the U-shaped groove is in an arc shape, which reduces the friction between the traction rod and the U-shaped groove and makes the traction rod easier to rotate.

[0036] The matching part is a convex point, and its surface is spherical. The height of the matching part is adjusted by using the matching of the spherical surface and the inclined surface, and the gradually rising or falling inclined surface, so as to drive the traction rod connected with it to rotate.

[0037] An annular columnar structure is provided at the lower end of the knob, and the inclined surface is arranged circumferentially along the annular columnar structure. The length of the inclined surface is equivalent to the maximum rotation angle of the traction rod, that is, the distance moved from the lowest point to the highest point of the matching part along the inclined surface is equal to the range of elastic force change that the instantaneous tension spring under the current hook can adjust.

[0038] The embodiments should not be regarded as limiting the present invention, but any improvements based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A multi-hook instantaneous adjustment mechanism, characterized in that: It includes: The knob is arranged on the surface of the molded case circuit breaker, and the lower end thereof is provided with an inclined surface arranged along the rotation direction of the knob; The traction rod is rotatably arranged inside the molded case circuit breaker, and one side of the traction rod is provided with a plurality of hooking parts for hanging the instantaneous tension spring, and the other side of the traction rod is provided with an extension part, the extension part extends to the bottom of the knob, the extension part is provided with a matching part for matching with the inclined surface, and the hooking part is provided with at least two hooks for adjusting the tension of the instantaneous tension spring along the axis of the hooking part. When the knob is rotated, the traction rod can be rotated, and the rotation of the traction rod can pull the instantaneous tension spring to stretch so as to change the elastic force of the instantaneous tension spring, thereby enabling the molded case circuit breaker to be disconnected under short-circuit currents of different multiples.

2. A multi-hook instantaneous adjustment mechanism according to claim 1, characterized in that: It also includes a support frame, which is fixedly connected to the molded case circuit breaker base and has U-shaped grooves on both sides for carrying a traction rod.

3. A multi-hook instantaneous adjustment mechanism according to claim 2, characterized in that: The surface of the support frame is provided with a table surface which can support and fix the knob. The knob part passes through the table surface and enters into the interior of the molded case circuit breaker and cooperates with the matching part of the traction rod.

4. A multi-hook instantaneous adjustment mechanism according to claim 3, characterized in that: The table top is provided with a limit block for limiting the maximum rotation angle of the knob, and the knob is provided with a protrusion that forms a limit fit with the limit block.

5. The multi-hook instantaneous adjustment mechanism according to claim 2, characterized in that: The portion where the traction rod cooperates with the U-shaped groove is in an arc shape.

6. The multi-hook instantaneous adjustment mechanism according to claim 1, characterized in that: The matching portion is a convex point, and its surface is spherical.

7. The multi-hook instantaneous adjustment mechanism according to claim 1, characterized in that: An annular columnar structure is disposed at the lower end of the knob, and the inclined surface is arranged along the circumference of the annular columnar structure.

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