RU2207646C2 - High-speed switch - Google Patents

Abstract

FIELD: circuit opening devices for specific (railway or motor vehicles, ships) and general-purpose installations. SUBSTANCE: high-speed switch has pin mounted on fixed support, pivoted lever mounted on mentioned pin and provided with second pin that carries movable contact with hook. Pawl is free to come in mesh with hook. Spring engaging movable contact sets up breaking moment. Other spring is in mesh with fixed support and functions to set up making moment. Spring engaging fixed contact is in mesh with pivoted lever and other spring that engages fixed support catches with its other end fixed contact and sets up additional breaking moment; stop is installed so that total force line due to making and breaking moments acting on contacting point between fixed contact and stop passes between fixed and second pin of pivoted lever. EFFECT: reduced energy requirement due to reduced force of making spring. 3 cl, 2 dwg

Description

 The invention relates to electrical equipment, and more specifically to high-speed circuit breakers, and can be used both in special electrical installations (rail and road transport, ships), and in general electrical installations.

 Known high-speed switches with a movable contact pivotally mounted on a movable support, and a breaking spring fixed at one end to a rigid support, and the second - at a movable contact so that in the on position the force of this spring creates a contact pressing, turning the movable contact about an axis fixed on a movable support, for example, the anchor of a holding electromagnet [1].

 Due to the presence of a rotational moment in the direction of switching on, the movement of the movable contact slows down during tripping and thereby reduces the speed of the circuit breaker.

 The closest in technical essence to the invention is a high-speed switch containing an axis mounted on a fixed support, a pivot arm mounted on a specified axis and having a second axis on which movable contact with a hook is mounted, a latch having the ability to engage with the hook, a spring engaged on a movable contact and creating a breaking moment, a second spring engaged on a fixed support and creating a turning moment, a fixed contact including a drive and a stop having in the disconnected position, the contact point with the movable contact, which is affected by the force of the breaking moment [2].

 In this high-speed switch, the spring creating the breaking moment, when turned on, counteracts the spring creating the turning moment, so the latter requires additional effort and, therefore, additional energy consumption for its tension.

 The objective of the invention is to reduce the energy consumption of the drive.

и l₁>l₂,
где М_откл и ΔМ_откл - отключающий и дополнительный отключающий моменты относительно второй оси поворотного рычага от пружин, зацепленных за подвижный контакт, а вторыми концами за поворотный рычаг и неподвижную опору соответственно;
М_вкл - включающий момент относительно неподвижной оси поворотного рычага от пружины, зацепленной за подвижный контакт и неподвижную опору;
l₁ и l₂ - нормали к линии действия суммарного усилия отключающего и дополнительного отключающего моментов соответственно от неподвижной оси и от второй оси поворотного рычага.To perform this task in a high-speed switch containing an axis mounted on a fixed support, a pivot arm mounted on a specified axis and having a second axis on which movable contact with a hook is mounted, a latch having the ability to engage with the hook, a spring engaged a movable contact and creating a breaking moment, a second spring engaged in a fixed support and creating a turning moment, a fixed contact, including a drive and a stop having a point with touches with a movable contact, which is affected by the force of the breaking moment, introduced new features, i.e. the spring hooked onto the movable contact is hooked by the second end to the pivot arm, the second spring hooked onto the fixed support, the second end is hooked onto the movable contact and creates an additional breaking moment, and the stop is set so that the line of action of the total force from breaking and from the additional breaking of moments acting on the contact point of the movable contact and the stop passes between the fixed and second axes of the pivot arm, while the following conditions are met:

and l ₁ > l ₂ ,
wherein M and ΔM _{none none} - disconnecting and disabling additional moments about the axis of the second pivot arm of springs hooked into the moving contact, and the second ends of the pivot arm and a fixed support, respectively;
M _on - includes a moment relative to the fixed axis of the pivot arm from a spring engaged in a movable contact and a fixed support;
l ₁ and l ₂ - normal to the line of action of the total effort of the disconnecting and additional disconnecting moments, respectively, from the fixed axis and from the second axis of the rotary lever.

 In the high-speed switch, the latch is pivotally mounted on the pivot arm, and the emphasis is movable and connected to the switching drive.

 The introduction of new features allowed the proposed switch to reduce energy consumption when turned on by reducing the force of the closing spring, which does not perceive the opposing force from the breaking spring, but rather partially helps the breaking spring to create a breaking force, which ultimately allows the use of a switching drive with less energy intensity.

 In FIG. 1 shows a quick switch in the off position; figure 2 - in the included.

 The switch has a fixed axis 1, with a pivoting lever 2 attached to it, having a second axis 3, on which the movable contact 4 is attached to the hook 5, which is able to engage with the latch 6 mounted on the lever 2. The springs 7 are hooked to the movable contact 4 and 8, the second ends of which are engaged in the lever 2 and the stationary support 9, respectively.

Force of the spring 7 to create two identical in magnitude but opposite in direction moments of tripping moment (M _none = F _none • l) acts on the movable contact 4 with respect to the axis 3 counterclockwise, and the second same moment acts on the arm 2 relative to the axis 1 of clockwise.

The spring force 8 creates additional tripping moment (ΔM _none = F _ON • l ₄₎ which acts on the movable contact 4 with respect to the axis 3 counterclockwise, and comprising torque (M _inc = F _ON • l ₃₎ which acts on the lever 2 relative to axis 1 clockwise.

The disconnecting and additional disconnecting moments, acting on the movable contact 4 relative to the axis 3, create a reactive force R at the point K of contact with the stop 10, which on the arm l ₁ creates an opposing moment counterclockwise on the lever 2 relative to the axis 1.

и l₁>l₂.The position stops 10 and 11 is chosen from the condition in the open position to provide the required solution S between the main contacts of the movable contact 4 and fixed contact 12, which however can be realized with a proper choice of isolation _none torque M, which is set from the conditions

and l ₁ > l ₂ .

можно представить в виде

где М_Q - избыточный момент при M_Q>0.Inequality:

can be represented as

where M _Q is the excess torque for M _Q > 0.

Excessive moment M _Q creates an opposing moment in the off position, pressing the lever 2 against the stop 11 with the force Q. This force in the circuit breaker can be used, for example, to switch auxiliary contacts, to control the blower device and for other needs that are specifically determined during the design of the circuit breaker.

 The inclusion is carried out by the actuator 13, the rod of which can be connected, for example, with a stop 10. In this case, the movable contact 4 rotates clockwise relative to the axis 3 until the engagement of the hook 5 with the latch 6 and the springs 7 and 8 are cocked, then the power from the actuator 13 is removed and the rotary lever 2 together with the movable contact 4 is rotated relative to the axis 1 to contact with the contact 12 under the action of the spring 8, which creates a contact pressing. In this case, the stop 10 returns to its original position, and an air gap is formed between the stop 10 and the movable contact 4, which ensures a failure during wear of the contacts 4 and 12.

 The circuit breaker is as follows. Under the action of the release force (not shown) in the direction of arrow A (see FIG. 2), the latch 6 rotates, which disengages from the hook 5. The movable contact 4 under the action of the springs 7 and 8 rotates about the axis 3 until it contacts the stop 10 and then, under the action of a reactive force R, the lever 2 is rotated about the axis 1 until it contacts the stop 11, forming together with the movable contact 4 the necessary solution S between the main contacts.

 Using the proposed switch allows you to reduce energy consumption when turned on by reducing the force of the closing spring 8, which does not absorb the opposing force from the breaking spring 7, but rather partially helps the breaking spring 7 to create a breaking force, which ultimately allows you to use a switching drive with less energy intensity.

Sources of information
1. Tikhmenev B.N. et al. Rolling stock of electric railways. - M.: Transport, 1969.p. 292 - 298.

 2. Hideki Ishida, Noboru Furuhayashi. Small-sized high-speed DC switch. - Mitsubishi Danki Guho, vol. 52, 3, 1978, p. 250-254 (prototype).

Claims (3)

1. A quick switch containing an axis mounted on a fixed support, a pivot arm mounted on the specified axis and having a second axis on which the movable contact with the hook is mounted, a latch having the ability to engage with the hook, a spring engaged with the movable contact and creating a disconnecting moment, a second spring engaged in a fixed support and creating a turning moment, a fixed contact, including a drive and a stop having a disconnected point of contact with the movable contact volume, which is affected by the force of the breaking moment, characterized in that the spring engaged in the movable contact, the second end is engaged in the pivot arm, the second spring engaged in the fixed support, the second end is engaged in the movable contact and creates an additional breaking moment, and the stop is installed so that the line of action of the total force from the disconnecting and from the additional disconnecting moments acting on the contact point of the movable contact and the stop passes between the fixed and second axes pivot arm, while the conditions are met

and
l ₁ > l ₂ ,
wherein M _otkl ΔM and _none - disconnecting and disabling additional moments about the axis of the second pivot arm of springs hooked into the moving contact, and second ends - for the pivot arm and a fixed support, respectively;
M _on - includes a moment relative to the fixed axis of the pivot arm from a spring engaged in a movable contact and a fixed support;
l ₁ and l ₂ are the normals to the line of action of the breaking and additional breaking moments, respectively, from the fixed axis and from the second axis of the pivot arm.  2. The high-speed switch according to claim 1, characterized in that the latch is pivotally mounted on the pivot arm.  3. The high-speed switch according to claim 1, characterized in that the emphasis in contact with the movable contact is movable and connected to a switching drive.

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