JPH0113178B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power switching switch for selectively connecting two different power sources, such as a regular power source and an emergency power source, to a load side.

A conventional electromagnetic power switching switch instantaneously and simultaneously opens and closes one contact and closes the other contact. For this reason, the non-voltage time of the contacts during the switching operation is extremely short, and there is a risk that the two power supplies may come into contact with each other.

The present invention was made by focusing on the above-mentioned problems of conventional switching switches, and the contacts are switched by the instantaneous movement of the movable core of the solenoid. By mechanically delaying the closing operation of the contacts and closing the contacts of the other power supply after completely opening the contacts of one power supply, the non-voltage time of the contacts when switching the power supply is extended, and the contact of the other power supply is closed. It is an object of the present invention to provide a power supply switching switch which can effectively prevent contact between two power supplies, and which has a simple and compact structure.

Embodiments of the invention will be described below with reference to the figures. On the base 1, there are first and second power opening/closing parts 2,
3 are attached, and an operating mechanism 4 for opening and closing them is provided above them. Each opening/closing part 2, 3 has an input side fixed contact 5 and an output side fixed contact 6 arranged in two rows facing each other in the case.
and a movable frame 8 having a plurality of movable contacts 7 which can reciprocate horizontally in the figure and can short-circuit and open between each pair of input and output side fixed contacts 5 and 6. The movable frame 8 has a pair of contact protrusions 9 that stand vertically upward at a distance from each other. An operating shaft 10 is vertically supported in the case and passes through the case. The operating shaft 10 has a cam 11 located between both contact protrusions 9 of the movable contact frame 8 within the case. The cam 11 has a substantially triangular cross section,
The movable frame 8 is rotated forward and backward in a range of about 90 degrees between the two contact protrusions 9, 9 while sliding in contact with them, and as the movable frame 8 moves left and right in FIG. 3 at one end of the rotation. 7 to the fixed contacts 5, 6, and at the other end, pull the movable contact 7 away from the fixed contacts 5, 6, and press both contact protrusions 9, 9 with the cam surface of the movable frame 8. Prevent movement. Note that the first and second power supply opening/closing parts 2, 3
When one of the fixed contacts 5 and 6 is in a short-circuited state, the other is in an open state between the fixed contacts 5 and 6. The output side fixed contacts 6, 6 of both power supply opening/closing parts 2, 3 are electrically connected to each other and connected to the load side. Further, the input side fixed contact 5 of the first power supply switching unit 2 is connected to a first power supply which is a regular power supply, for example, and the input side fixed contact 5 of the second power supply switching unit 3 is connected to a first power supply which is, for example, an emergency power supply. 2 Connected to power supply.

The operating mechanism 4 includes a pair of links 12, 13 and movable arms 14, 15 corresponding to each power opening/closing section 2, 3.
a closing spring 16 provided between the movable arms 14 and 15, and a latch plate 1 that alternately engages the movable arms 14 and 15.
It consists of 7.

The pair of movable arms 14 and 15 each have a pivot 3 at one end connected to a yoke 31 of a solenoid further fixed on a support plate 18 fixed to the base 1.
2 and 33 for horizontal rotation, and a closing spring 16 is interposed between the other ends. The closing spring 16 is housed in two spring cylinders 19 and 20, each having a large diameter and a small diameter, which are fitted into each other so as to be able to move in and out in the axial direction. And a large diameter spring tube 19
is pivotally attached to the other end of one movable arm 14 by a pivot 21, and a small diameter spring cylinder 20 is pivotally attached to the other end of the other movable arm 15 by a pivot 22. Inside the middle part of each movable arm 14, 15, movable iron cores 2 protrude so as to face each other.
3 and 24 are fixed. These movable iron cores 2
3 and 24 can be attracted into a pair of solenoids 25 and 26 respectively fixed on the support plate 18 when energized.

One end of the links 12 and 13 is fixed to the operation shafts 10 and 10 of each power supply opening/closing part 2 and 3 that protrude upward from the case, and the other end is fixed to the notch hole 18a of the support plate 18,
It is pivotally connected to pivot shafts 21 and 22 extending downward through 18b. Therefore, the operating shaft 10 is rotatable as the movable arms 14 and 15 swing.

The latch plate 17 is pivoted at the center on the support plate 18 by a shaft 36, and the sliding parts 37 and 38 at both ends are pushed by the pivots 22 and 21 at the tips of the arms 15 and 14 so that the latch plate 17 can swing freely. . The latch plate 17 has engagement recesses 27 and 28 on both sides that can be selectively engaged with the pivots 21 and 22 at the ends of the movable arms 14 and 15 when the latch plate 17 is tilted. The latch plate 17 hooks one of the pivot shafts 21, 22 into the engagement recesses 27, 28 in the tilted state and restrains it, but the other pivot shaft 22, 21, together with one of the movable arms 14, 15, When it moves inward and reaches the engagement recesses 28 and 27, it rotates and the pivot shaft 2
Release 1 and 22.

The limit switches 29 and 30 are connected to the latch plate 17.
When the latch plate 17 is tilted, it is pressed against one side of the latch plate 17 to close these contacts, and the contacts are selectively opened and closed depending on the direction in which the latch plate 17 is tilted. The contact points of these limit switches 29 and 30 are solenoid 2, respectively.
The latch plate 17 is provided in the excitation circuits 5 and 26.
When the limit switches 29 and 30 are separated from the hinge levers, the circuit is opened and the excitation current is cut off.

Next, the operation of this switching switch will be explained based on FIGS. 4 to 6. In FIG. 4, the first power switch 2 connected to the regular power source is closed, and the second power switch 3 connected to the emergency power source is open, so that the load is supplied with the regular power. The pivot 21 at the tip of the movable arm 14 contacts the side surface near one end of the latch plate 17 to tilt it, presses the hinge lever of the limit switch 29 to close it, and engages one recess 28 with the pivot 22. There is.

In the state shown in FIG. 4, when the solenoid 25 is energized to switch the power supply, as shown in FIG.
The movable iron core 23 is attracted, and one movable arm 14
rotates in the arrow direction (inward) about the pivot shaft 32 while bringing the pivot shaft 21 at the tip into sliding contact with the sliding contact portion 37 on one end side of the latch plate 17. The movable arm 14 rotates the operating shaft 10 of the first power switch 2 via the link 12, opens the contact, and interrupts the emergency power circuit. However, in the state shown in FIG. 5, the engagement recess 28 on the other end side of the latch plate 17 is still engaged with the pivot shaft 22, so the other movable arm 15 cannot rotate outward. Therefore, one movable arm 14 rotates independently while compressing the closing spring 16 and storing its energy. Therefore, in this state, the second power switch 3 does not operate yet.

As shown in FIG. 6, one of the movable arms 14 rotates further and the pivot 21 at the tip of the movable arm 14 rotates around the latch plate 1.
7, one end of the latch plate 17 loses its support, and the other end of the latch plate 17 becomes attached to the pivot 2.
2 and rotates in the arrow direction, and the engaging recess 28 releases the movable arm 15. Then, the movable arm 15 rotates in the arrow direction (outward) by the force of the stored spring 16, rotates the operating shaft 10 of the second power opening/closing part 3 via the link 13, and is movable by the cam 11. Move frame 8. During this time, the pivot 22 slides against and pushes the sliding contact portion 38 at the other end of the latch plate 17, causing the latch plate 17 to rotate and tilt in the direction of the arrow.

Then, as shown in FIG. 7, the second power supply opening/closing section 3
The contacts close and the emergency power supply is connected to the load side.
During this time, the latch plate 17 is separated from the limit switch 29, the solenoid 25 is demagnetized, and the other limit switch 30 is contacted and closed to form an excitation circuit for the solenoid 26. In other words, after the contact connected to one power source is opened, the contact connected to the other power source is closed after a predetermined delay time, and when the power source is switched, both contacts are opened for a relatively long time. A no-voltage state is ensured for a period of time, and contact between the two power sources is avoided. Fixed contacts 5 and 6 in contact with each other
Although an electromagnetic repulsive force acts between the movable contact 7 and the movable contact 7, the cam surface of the cam 11 is in contact with both contact protrusions 9 of the movable frame 8, so the movable frame 8 cannot move easily. Therefore, there is no risk that the fixed contacts 5, 6 and the movable contact 7 will separate. Then, the recess 27 of the latch plate 17 and the pivot 21 are engaged, and the movable arm 14 is restrained. The switching operation from the emergency power source to the regular power source is performed in the opposite manner.

As described above, in the present invention, one end of the pair of opposing movable arms 14 and 15 is pivotally connected to each other, a pressure spring 16 is interposed between the other ends, and the arm 1
4 and 15 are arranged so that they can swing inward alternately in conjunction with the suction operation of the movable iron cores 23 and 24 of the solenoids, and when swinging inward, they are connected to the other movable arm 14 via the spring 16. , 15 are arranged so as to be pressed and swung outward, and the middle part of the latch plate 17 is pivotally connected between the pair of movable arms 14 and 15, and the arms 14 and 15 are attached to both ends of the latch plate 17, respectively. When it swings in the direction, it is pushed by this and tilts,
A sliding contact portion 3 that slides into contact with the tips of the arms 14 and 15
7, 38, and an engaging portion 27 that selectively engages the tip end portions of the arms 14, 15 depending on the inclination direction to prevent the arms 14, 15 from swinging outward.
28 are provided, and these sliding contact parts 37 and 38 and the engaging part 2
7, 28, one arm 14, 1
The other arm 15, until the inward swing of the arm 5 is completed.
14 is prevented from swinging outward, and during this time the spring 16 is charged, and at the same time as the inward swinging of one arm 14, 15 is completed, the other arm 15, 14 is released, and the spring 16 is
The first and second power opening/closing parts 2, 3 are configured to allow the other arms 15, 14 to swing outward due to the releasing force of the arms 14, 15, and the first and second power supply opening/closing parts 2, 3 respectively Since the power supply switching switch is constructed by connecting to the arms 14 and 15 so as to open the contacts and close the contacts in conjunction with the outward swinging, the contacts connected to one power source are surely opened and then the other contacts are closed. It is possible to provide a power switching switch with a simple structure and a compact structure, which can input a contact connected to a power source, ensure a relatively long non-voltage state of both contacts during this period, and effectively prevent the two power sources from coming into contact with each other. can.

[Brief explanation of drawings]

Figure 1 is a plan view of the switching switch, Figure 2 is a partially cutaway front view, Figure 3 is a side view, and Figures 4 to 7 show the operating order of the switching switch.
is the first power opening/closing part, B is the movable member, and C is the second power supply opening/closing part.
FIG. 3 is a schematic plan view of a power supply opening/closing section. 2...First power supply opening/closing part, 3...Second power supply opening/closing part, 1
4, 15...Movable arm, 16...Press spring, 17...
Latch plate, 21, 22... Pivot, 23, 24... Movable core, 25, 26... Solenoid, 27, 28... Engagement recess, 36... Pivot, 37, 38... Sliding portion.

Claims (1)

[Claims] 1. In a power supply switching switch for selectively connecting two different power supplies to the load side, one end is pivotally connected to each other, a pressure spring is inserted between the other ends, and a solenoid a pair of opposing movable arms arranged to alternately swing inwardly in conjunction with the suction operation of the movable iron core, and press and swing the other arm outward via the push spring; The middle part is pivotally connected between the pair of movable arms, and each end has a slide that slides into contact with the tip of the arm so that it is pushed and tilted when the arm swings outward. a contact portion; and an engagement portion that selectively engages with the tip of the arm depending on the inclination direction to prevent the arm from swinging outward; The outward swinging of the other arm is prevented until immediately before the inward swinging of the other arm is completed, and the push spring is stored, and the other arm is released at the same time as the inward swinging of one arm is completed. A latch plate is arranged to allow the other arm to swing outward due to the releasing force of the push spring, and a latch plate is arranged to open the contact points in conjunction with the inward swing of each arm, and to allow the other arm to swing outward. A power supply switching switch comprising first and second power supply opening/closing parts that respectively close contacts in conjunction with each other.