An instant adjustable device

Abstract

A kind of instantaneous adjustable device, it includes armature support, armature and spring, wherein the armature can be swinged to be arranged on the armature support, spring one end is connected with armature support, its other end is connected with armature, armature support both sides extend downward and form first supporting arm, and first supporting arm one side is equipped with fixed structure, the armature is connected with fixed structure by the rotation shaft of both sides, and with first supporting arm forms swing connection;Any one first supporting arm of the armature support extends in the direction opposite to armature swing and forms connecting arm, the connecting arm is equipped with several first gear slots extending in the direction opposite to swing;The both sides of the armature respectively extend downward and form second supporting arm, and the inner side of any one second supporting arm is equipped with several second gear slots arranged along the axis direction of second supporting arm.The armature support of multiple gears and the armature of multiple gears, counterforce spring is hung in different gear by adjusting, can be according to different current, by adjusting the holding position of spring to check instantaneous protection.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to an instantaneously adjustable device. Background Technology

[0002] A circuit breaker is a switching mechanism that can close, carry, and interrupt current under normal circuit conditions, and can close, carry, and interrupt current under abnormal circuit conditions within a specified time.

[0003] A circuit breaker typically consists of a contact system, an arc-extinguishing system, an operating mechanism, a tripping mechanism, and a casing. When an overload or short circuit occurs in the circuit, i.e., when the current in the circuit exceeds the circuit's safe current value, the tripping mechanism will move, causing the traction rod to rotate, thereby tripping the circuit breaker and cutting off the power supply to the circuit.

[0004] The tripping mechanism configured in each different circuit should meet the requirement of tripping when the circuit current exceeds the safe current value; that is, the tripping mechanism is configured differently in different circuits because their safe current values ​​are different; the existing circuit breaker tripping mechanism is either suitable for high current circuits or low current circuits, and cannot be suitable for both types of circuits at the same time.

[0005] Molded case circuit breakers have multiple rated currents In under their frame current ratings. For example, a 250 frame has In=63, 80, 100, 125, 140, 160, 180, 200, 225, and 250A. The instantaneous protection factor for each rated current is 10In±20%. Since the structure of the armature support and moving armature is fixed, conventional circuit breakers have one position for the moving armature and one position for the armature support. The length of the return spring is also fixed. Adjusting the instantaneous protection factor for different rated currents requires adjusting the size of the return spring, resulting in higher costs and a more complex manufacturing process. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an instantaneously adjustable device.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An instantaneously adjustable device includes an armature support, an armature, and a spring, wherein the armature is oscillatingly mounted on the armature support, and one end of the spring is connected to the armature support, while the other end is connected to the armature.

[0009] The armature bracket extends downward on both sides to form a first arm, and a fixed structure is provided on one side of the first arm. The armature cooperates with the fixed structure through the rotating shafts on both sides and forms a swing connection with the first arm.

[0010] Any one of the first arms of the armature bracket extends in the opposite direction of the armature swing to form a connecting arm, and the connecting arm is provided with a plurality of first stop grooves extending in the opposite direction of the swing.

[0011] The armature extends downward on both sides to form a second arm, and each second arm has a number of second gear slots arranged along the axis of the second arm.

[0012] One of the fixing structures is a slot, and the other is a round hole, and the two are respectively set on the two first arms.

[0013] One of the second arms has a limiting block on one side, the limiting block is located below the rotation shaft, and a limiting groove is formed between the two. The first arm on the corresponding side has a limiting member placed in the limiting groove.

[0014] The connecting arm is formed by multiple 90° bends, and each bend is provided with a first gear groove.

[0015] The first gear slot has 3 slots.

[0016] The second gear slot has 3 slots.

[0017] The beneficial effects of this utility model are as follows: by adopting a multi-position armature bracket and a multi-position armature, the reaction spring can be adjusted and hung at different positions, and the instantaneous protection can be checked according to different fixed currents by adjusting the hanging position of the spring. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the force analysis of the armature of the magnetic trip unit.

[0019] Figure 2 This is a schematic diagram showing the interaction between the present invention and the moving contact assembly.

[0020] Figure 3 This is a schematic diagram of the structure of a single instantaneously adjustable device and a moving contact assembly of this utility model.

[0021] Figure 4 This is a schematic diagram of the structure of this utility model.

[0022] Figure 5 This is a side view of the present invention.

[0023] Figure 6 This is a schematic diagram of the armature support structure.

[0024] Figure 7 This is a schematic diagram of the armature structure. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] like Figure 2 and Figure 3 As shown, an instantaneously adjustable device, mainly used in molded case circuit breakers, can match the spring force to the electromagnetic attraction force by adjusting the position of the spring.

[0028] The principle is that when a short circuit occurs, the short-circuit current flows through the current-carrying conductor. According to the principle of electromagnetic fields, a magnetic field is generated around the current-carrying conductor. Since the stationary iron core and armature are made of ferromagnetic materials, the magnetic field mainly flows through the stationary iron core and armature, and at the same time, it also exerts an attractive force on the armature. This attractive force overcomes the action of the reaction spring and attracts the armature to rotate towards the stationary iron core. During the rotation, the armature will touch the traction rod. If the attractive force generated by the magnetic field is large enough, the armature will push the traction rod to rotate, thereby releasing the transmission mechanism that is fastened to the traction rod and completing the release.

[0029] During its movement, the armature is primarily subjected to electromagnetic attraction and spring reaction force. When the armature encounters the traction rod, the traction rod also exerts a reaction force on the spring. Therefore, for the electromagnetic release device to complete the release process, the torque of the electromagnetic attraction force must be greater than the torque of the reaction force. In design, the method of ensuring that the electromagnetic torque is greater than the spring reaction torque is often adopted. Since the working gap continuously decreases during the armature engagement process, both the electromagnetic force and the spring reaction force continuously increase. Therefore, there is a certain functional relationship between the electromagnetic force and the spring reaction force and the working gap. Let the working gap be... β Then electromagnetic force F = f 1(b), Spring reaction force F f = f 2 ( b ), and electromagnetic torque M It must be greater than the spring reaction torque. M f .

[0030] like Figure 1As shown, the force analysis of the armature of the magnetic trip unit neglects the armature's own weight, the frictional force during its rotation, and the reaction force when the armature collides with the traction rod. Based on the characteristic that the electromagnetic torque on the armature is greater than the spring reaction torque, the inequality can be obtained.

[0031] F x L 2 cosβ+F y L 2 sinβ>F f L 1 cosβ .

[0032] like Figure 4 As shown, the instantaneously adjustable device includes an armature bracket 100, an armature 200, and a spring 300. The armature 200 is swayably mounted on the armature bracket 100. One end of the spring 300 is connected to the armature bracket 100, and the other end is connected to the armature 200. The armature bracket includes a plate-shaped structure 120, whose two ends are bent and extend downward to form a first arm. Its projection is U-shaped. A conductive element 500 is fixed on the plate-shaped structure 120, and the conductive element 500 is electrically connected to the moving contact 400 through a wire.

[0033] like Figure 6 As shown, the armature bracket 100 extends downward on both sides to form a first arm 130, and a fixed structure is provided on one side of the first arm 130. The armature 200 cooperates with the fixed structure through the rotating shafts 220 on both sides and forms a swing connection with the first arm 130. The fixed structure is a hole-shaped or groove-shaped structure, in which the rotating shafts 220 can be fixed inside and swing relative to each other.

[0034] Any one of the first arms 130 of the armature bracket 100 extends in the opposite direction of the swing of the armature 200 to form a connecting arm 110, and the connecting arm 110 is provided with a plurality of first stop grooves 111 extending in the opposite direction of the swing.

[0035] like Figure 7 As shown, the armature 200 extends downward on both sides to form a second arm 210, and each second arm 210 has a plurality of second gear slots 230 arranged along the axis of the second arm 210.

[0036] like Figure 5 As shown, when the circuit current exceeds the safe current value, the magnetic force acting on the armature 200 in the circuit is greater than the reaction force of the spring 300 on the armature 200, and the lower end of the armature 200 swings away from the spring 300. The direction of the swing is as follows: Figure 5 As indicated by the horizontal arrow, its vertical direction is as shown in the vertical direction.

[0037] The armature is U-shaped, with two second arms arranged opposite each other, and the rotating shaft is located on the outside of the second arms for easy fixation to the armature bracket.

[0038] One of the fixing structures is a slot 132, and the other is a round hole 131, both of which are respectively set on the two first arms 130. By adopting an open-end design, it is easier to snap the armature into the fixing structure when fixing it, that is, the rotating shaft on one side is inserted into the round hole, while the rotating shaft on the other side is limited by the open slot.

[0039] One of the second arms 210 has a limiting block 240 on one side, which is located below the rotating shaft 220 and forms a limiting groove 250 between them. The first arm 130 on the corresponding side has a limiting member 133 placed in the limiting groove 250. The limiting groove is used to limit the maximum swing angle of the armature.

[0040] The connecting arm 110 is formed by multiple 90° bends, and each bend has a first stop groove 111. Multiple parallel segments are formed by bending, and a protrusion is provided at one bend point to isolate the parallel segments and prevent the spring from detaching from different segments. This method shortens the length of the connecting arm and ensures that the parallel segments and the second stop groove are on the same plane, preventing the spring from twisting and ensuring consistent force direction when holding it.

[0041] In this embodiment, there are three first gear slots 111 and three second gear slots 230. The same spring can be selected at different gears according to the instantaneous multiple of 10ln±20%, thereby adjusting the spring force to match the electromagnetic attraction force.

[0042] The principle behind adjusting the force of the spring is as follows: F=kx , k For spring stiffness, x To adjust the spring's extension length, select a stop from the armature and a stop from the armature bracket, thereby changing the spring's length and its force.

[0043] If the rated current is small, the electromagnetic attraction force will be small. In this case, the spring will be suspended at the position with the shorter length to reduce its force.

[0044] If the rated current is large, the electromagnetic attraction will be strong. In this case, suspend the spring at the position with the longer length to increase its force.

[0045] The design with three first-gear slots and two-gear slots allows for nine suspension positions with a single spring, meeting the needs of different rated currents, reducing costs, and facilitating installation.

[0046] The embodiments should not be regarded as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A transiently adjustable device, characterized by: It includes an armature support (100), an armature (200), and a spring (300), wherein the armature (200) is swayably mounted on the armature support (100), and one end of the spring (300) is connected to the armature support (100), and the other end is connected to the armature (200). The armature bracket (100) extends downward on both sides to form a first arm (130), and a fixed structure is provided on one side of the first arm (130). The armature (200) cooperates with the fixed structure through the rotating shafts (220) on both sides and forms a swing connection with the first arm (130). Any one of the first arms (130) of the armature bracket (100) extends in the opposite direction of the swing towards the armature (200) to form a connecting arm (110), and the connecting arm (110) is provided with a plurality of first stop grooves (111) extending in the opposite direction of the swing. The armature (200) extends downward on both sides to form a second arm (210), and a number of second gear slots (230) are provided on the inner side of any second arm (210) along the axis of the second arm (210).

2. The instantaneously adjustable device according to claim 1, characterized in that: One of the fixing structures is a slot (132), and the other fixing structure is a round hole (131), and the two are respectively set on the two first arms (130).

3. The instantaneously adjustable device according to claim 1, characterized in that: One of the second arms (210) has a limiting block (240) on one side, the limiting block (240) is located below the rotating shaft (220), and a limiting groove (250) is formed between the two. The first arm (130) on the corresponding side has a limiting member (133) placed in the limiting groove (250).

4. The instantaneously adjustable device according to claim 1, characterized in that: The connecting arm (110) is formed by multiple 90° bends, and each bend is provided with a first stop groove (111).

5. A momentarily adjustable device according to claim 1 or 4, characterized in that: There are 3 first gear slots (111).

6. The instantaneously adjustable device according to claim 5, characterized in that: There are 3 second gear slots (230).

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