KR830001069Y1 - Vacuum Contactor - Google Patents

Abstract

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Description

Vacuum Contactor

1 is a side view of a partial longitudinal section showing the open circuit position of the vacuum contactor assembly according to the present invention.

2 is a side view showing a closed circuit position of the contactor assembly.

The present invention relates to a switchgear suitable for use in an electric motor starter and similar control device. General type switchgear related to this is described in US Patent Nos. 3,264,431; 3,264,432; 3,066,366; 3,264,433; 3,264,433; 3,290,468, 3,898,407; And 3,921,109, which are typically used as contactors for their electric motor starters, for example, starters that are rated for 2.5 or 5 KV and 400 amps and connected to electric motors up to about 3,000 horsepower. .

This type of switchgear always requires the contact to be kept closed until the fuse in the circuit is cut off under a short circuit or abnormal overcurrent due to a short circuit. The contact is subjected to a strong magnetic force to release the contact, causing a strong arcing phenomenon between the contacts.

In order to prevent this from happening, a very strong contact pressure is required to keep the contact closed in response to the force to release the contact.

The switchgear or contactor used for a motor control apparatus may be a crane type. In recent years, however, vacuum switchers have been used for certain advantages, such as the absence of arcing in the air and the very short closing time and current interruption time achieved by the short and powerful operating forces, which are particularly required in mines or certain chemical plants. The switchgear used has a good response.

The main object of the present invention is to provide a strong contact pressure sufficient to effectively cope with any undesirable force to detach the contact, and at the same time can be used in existing control devices and open and close It is to provide an improved vacuum type switchgear which is compact so that it can be exchanged with the device.

Therefore, the present invention provides at least one electrode unit comprising an operating shaft, an actuating means for performing the rotational movement of the shaft when energy is obtained, and a vacuum switch including a movable contact member, the rotation of the aforementioned shaft A coupling operatively connected between the actuating shaft and the movable contact member such that the actuating shaft stays in the closed contact position while the actuation means gains energy by converting the motion into a close contact movement of the contact member An effective means of moving the contact member to an open position when this energy is lost, and a contact pressure generating means, which is sensitive to the current flowing through the switch to provide a force to generate a contact pressure proportional to the current flow. There is a fixed support point between the center and one end, and the one end described above is movable contact member and pivto. The aforementioned contact pressure generating means, consisting of the above-mentioned combination comprising a connected lever, and a bent conductor which forms a two-legged reverse current loop that is well influenced by a repulsive force proportional to the amount of current flowing. The tactic in which the aforementioned repulsive force is transmitted in order to impact the lever in a direction which increases the contact pressure and is supported by one of the above-mentioned legs which is securely fixed and near the opposite end of the one end described above. It is a vacuum type switchgear composed of one of the legs.

Referring to the embodiments of the present invention with reference to the accompanying drawings for example as follows.

The vacuum contact assembly shown in the drawing comprises a metal plate (2), an insulating plate (3) bolted to a portion of the frame as in (35) and (36), and a pair of detachable contacts (5) and ( It consists of a vacuum circuit breaker or switch (4) which comprises 6) and is fixed and supported on the insulating plate (3). The lower contact 6 is a stationary contact having a shaft 37 extending through the hole of the insulating plate 3 and clamped to the electrical connector 7, for example clamped. The connector 7 is connected to the single load terminal assembly 9 via the conductor 8.

The movable contact 5 of the vacuum circuit breaker 4 is provided with a connecting means 10 that is adjustable to an actuating lever 11 supported by a pivot on the 12 of the metal out-of-lug lug portion 13. It has an axis 32 connected through it. Thus, the lever 11 has a fixed support point at 12 located between one end connected to the movable contact portions 5 and 32 by pivot and the center of the lever. This is a good mechanical advantage. The lever 11 is connected to the pivot at 14 with a furcation 15, which has an adjustable connection 16 through the bend of 15.

The lower side of the insulator 18 is screwed to the elongate bolt 20 which extends through the upright cylindrical part 20a of the U-shaped link 22 in the state of the screw. The curved portion of the link is used as a support of the contact pressure spring 21, and cooperates with each other on the opposite side together with the wide side of the elongated bolt 20, that is, the head 43.

U-shaped actuating link 22 has a foot, ie faircase, connected to pivot by crank arm 24 at 23. The crank arm 24 is the main part of the contactor assembly which, when energized, is operatively connected to an electronic actuation means (not shown) for rotating the contact, i.e. clockwise, as shown in the figure. It is firmly fixed to the working shaft 26 by a key 25. The so-called kick-out spring 41, which is weaker than the contact pressure spring 21, acts on the insulator 18 in the direction in which the contact opens to obtain a contact when the energy is released to the electronic actuating means.

The spring 21 is centered around the short stroke and large force normally required to operate the high power vacuum switch, and the horizontal line passing through the shaft 26 as indicated by 39 in FIG. 1 and 40 in FIG. The relief is a form that provides the angular movement of the same working crank arm 24. The rotational motion of the shaft 26 and the crank arm 24 generated by the electromagnetic actuator is converted into the closed contact motion of the movable contact portions 5, 32 via the connections 11-23. The connection actually consists of two parts, one of which consists of a connector 22 with a cylindrical part 20a and a pivot to the crank arm 24, the other from (11) to (20). It is composed of parts and connected to pivot by contact part. The two connecting portions are connected together through the bullous connection formed by the 20 and 20a, and the contact pressure spring 21 is sandwiched therebetween.

The current carrying portion of the contactor assembly is arranged to provide a very high contact pressure instantaneously in the event of a short circuit or short circuit. Thus, the outer part of the shaft 32 of the movable contact 5 is fixed to the connector 30 by means of a clamp, the connector 30 being connected to a conductor 27 which can be bent at 31. It is connected to a rigid conductor 28. The bendable conductor 29 is connected to a rigid conductor 28 from a leg that is immovable and from the leg to which the movable leg of the loop is fixed by the current flowing through the loop portion in the opposite direction. The reverse current loop, together with the other leg of the loop, holding the shoulder or flange portion 11a of the lever 11 to force the lever 11 in the direction of increasing contact pressure when a pushing force is generated. To form. This force, of course, increases with the amount of current flowing through the deflectable conductor 29, which is substantial under extreme overcurrent conditions.

Immediately visible means of viewing are provided to adjust the contact gap and the excess reciprocation of the vacuum breaker. The means are capable of adjusting connection of the lever 11 to the stud 33 and a stud 33 with a threaded groove extending from the shaft 32 through the sleeve of the lever 11. It consists of two locking nuts 34 used together with a sleeve.

The vacuum contactor assembly described herein can be, for example, 400 amps 5KV class, and can be used with a vacuum switch adapted to a typical existing contactor size, and the applicant's trademark "Ampgard" 26. It is fully interchangeable with the existing contactors used in the motor starters listed in the text.

Although only a single phase of the contactor assembly is shown in the figures, by using a large number of crank arms such as (24) secured to the working shaft 26, a multiphase case is similar to what is currently seen. It can be understood that also possible.

Description of operation

When the electronic actuating means gains energy, torque is applied to the main operating shaft which rotates the crank arm 24 clockwise, as shown in FIG. 1, so that the kick-out spring 41 is compressed. And the entire device composed of parts 14 to 22 moves like one element to push the operating lever 11 in the direction of closing the contact about the fixed pivot 12. During the closed contact operation at this stage, the contact pressure spring 21, which is much stronger than the kick-out spring 41, is not compressed.

The trajectory of the pivot 44 between the lever 11 and the contact shaft 32 forms a very short arc that is bisected by the centerline passing through the pivot 12, the trajectory being a straight line. Very close to As a result, a displacement of less than a few thousandth of an inch is not unfavorable for the mechanical life of the metal bellows 42 of the vacuum device, but rather sufficient to destroy the welding spots that occur on the contact surface. Do.

Movement of the contact and compression of the kick-out spring 41 continue until the contact (5) and (6) actually touches, and when the contact touches, the entire device except the contact pressure spring (21) is stopped, and the link (22) The contact pressure spring 21 is now compressed with the cylindrical portion 20a which slides the bolt 20 as it continues to move upwards.

This operation of the link 22 and subsequent compression of the spring 21 ends when the electronic actuating means for driving the shaft 26 are closed. Thereafter, the contacts 5 and 6 of the vacuum breaker are obtained by subtracting the force of the kick-out spring 41 by adding the force of the contact pressure spring 21 to the force by the atmospheric pressure acting on the bellows 42. It remains closed by the result of the three forces, of course it should be noted that the kick-out spring is only compressed until the contact is closed and is no longer compressed while the spring 21 is being compressed.

As shown in FIG. 2, the distance between the head 43 of the bolt and the bent portion of the link 22 in the closed position of the vacuum switch 4 indicates the degree of spring compression and the degree of contact excess and reciprocation.

If the electronic actuation means loses energy, the shaft 26 can rotate freely, thus firstly causing the link 22 to hit the bolt head 43 with the contact pressure spring 21 returning to its original state. And any contact welding points that may occur at the contacts 5 and 6 are destroyed, and the separation of the contacts starts, and as the kick-out spring 41 returns to its original state, the separation of the contacts is completely completed and the result is shown in FIG. You will be returned to the same location as the bar.

The advantage obtained from the vacuum contactor assembly described above is the strong closed contact force generated upon overcurrent as an effect of the reverse current loop formed by the deflectable shunt 29. By proper selection of the shape of the loop and its suppressed state, a backlash can be created between the legs of the loop which can give the lever 11 a very strong transient contact force at a level of current exceeding the rating of the switchgear. The force holds the contacts 5 and 6 firmly in the closed contact state long enough for the current limiting fuse to break. This, of course, helps to avoid undesired arcing between the contacts that would otherwise occur if the contacts suddenly open.

Another advantage is that the connection of the insulator 18 and the springs 21, 41 can be adjusted immediately, especially if the spring bearing is made from a hexagonal column, and the pivot 44, including the lock nut 34, is provided. This is because it is on the phase measurement plane, a position where immediate overshoot reciprocal adjustment at.

Moreover, the mechanisms of (20a), (21) and (43), which cause a strong blow to be supplied when the working electromagnet loses energy, help to destroy any weld points of possible contacts.

Furthermore, in contrast to a toggle device which has a relatively slow opening and closing movement while applying a relatively strong force, the above-described mechanism provides accurate opening and closing speed to the movable contact 5 without excessively deforming the vacuum circuit breaker components. to provide.

Finally, the switch 4 and the connection 11-22 for the opening and closing operation are arranged in a substantially U-shape together with the lever 11 corresponding to the curved portion of the U in the side view, so that the contact element 5 ), (32) and (6) and (32) provide a relatively small sized arrangement.

Claims (1)

At least one electrode unit comprising an operating shaft, an actuating means for performing the rotational movement of the shaft when energy is obtained, and a vacuum switch including a movable contact member, and the rotational movement of the shaft The above-mentioned actuating means and the coupling operatively connected between the actuating shaft and the movable contact member so that the actuating shaft stays in the closed contact position while the actuating means is gaining energy by converting it into a close contact motion of the contact member. Effective means for moving the contact member to the open position when energy is lost, and contact pressure generating means responsive to the current flowing through the switch to provide a force to generate contact pressure proportional to the current flow; There is a fixed point 12 fixed between the center and one end thereof, the one end of which is described above as a movable contact member 5, 32 and a pivot. The aforementioned contact pressure generation, which consists of the above-mentioned coupling comprising a connected lever and a bent conductor 29 forming a two-legged reverse current loop that is well influenced by a repulsive force proportional to the amount of current flowing. The lever in the direction supported by the means, one of the legs described above immovably fixed, and one portion 11a of the aforementioned lever 11 near the opposite end of the one end described above and increasing the contact pressure; Vacuum-type switchgear, characterized in that composed of one of the other of the above-mentioned legs that the aforementioned repulsive force is transmitted to give a shock to.