KR20000014499A - Two-articulated type trip free instrument for switch assembly - Google Patents

Abstract

PURPOSE: A two-articulated type trip free instrument for switch assembly is provided to enhance performance and reliability and save energy over 40%. CONSTITUTION: The two-articulated type trip free instrument for switch assembly comprises: switches(12,112) coupled to a switching means and switching the switching means into trip status or input status; the first link(13) consisted of a switch lever arm having a mobile switch; a means supporting said first link to be swiveled about the first swivel point for the trip free motion and switch contact open motion; the second links(14,118) having a roller contacted to a cam and a trip roller limited by a trip latch; a means supporting said second links to be rotated about the second swivel point; a means connecting said first and second links to be swiveled about said second swivel point; a means moving downwardly the second links in a switch input status, swiveling said second links about said second swivel point in switching to a switch open status, separating the cam and roller, and again contacting the cam and roller in switching the switch input status; and a means rotating the trip latch to slide the roller of the second links on the surface of the cam.

Description

2-Link Linkage Trip-Free Mechanism for Switch Assembly

The present invention relates to a two-link trip-free mechanism for use in high voltage circuit breakers.

As is well known, circuit breakers are part of circuit protection and safety devices used in a wide range of voltage levels, and are used in high and ultra high voltage circuits with voltages up to 25,000 volts. In addition, when using the circuit as described above, the condition required for the circuit breaker is to be able to freely trip at any operating position associated with the input, wherein the term trip free means that the contact is opened while freeing the trip. This means that a trip may occur even when the contact part is inserted or the closing operation of the switch is performed. The circuit protection and safety device or operator instantly opens the contact and, if necessary, overrides the switch closing operation, causing the circuit breaker to break the circuit. In addition, in order to allow trips to occur freely in the circuit breaker, the circuit breaker structure is designed in such a way that a plurality of links are interconnected to move the switch contacts of the circuit breaker to an open or closed position.

On the other hand, Figure 1a shows the entire assembly 1 of the two-link link-free mechanism for operating the switch, the switch 2 includes a fixed contact portion 2A and a mobile contact portion 2B, which are mutually open It is in the state that became. The movable contact portion 2B is connected to the link 3 by a rotation joint 3A. The link 3 is rotatably mounted on the rotary joint 3B connected to the stationary support 2A. A roller 3C which is in rolling contact motion with the cam end 6A of the cam link 6 is connected to the end side of the right upward bent portion of the link 3. The left side of the cam link 6 is connected to the movable support 7 which is movable in the direction of the arrow with a rotary joint 6B, and is configured to pivot about the rotary joint 6B. The assembly 1 also includes a return spring 5 connected to the link 3 and a drive spring 10 connected to the cam link 6. The cam link 6 receives a downward switch input force by the driving spring 10 tensioned in the initial switch open state, but is restricted by the input latch 9, and the restraint by the input latch 9 is released. When the driving spring 10 is applied with a downward switch input force FA to the cam link 6, the cam link 6 is rotated clockwise as shown by an arrow to be in a switch input state as illustrated in FIG. 1B. In addition, the return spring 5 for applying the upward switch opening force FB to the link 3 to keep the switch 2 in the normally open state is rotated clockwise about the rotation joint 3B during the closing operation. Tensioned by the link 3.

FIG. 1C shows an operation state when the trip latch 8 is released in the state in which the switch 2 is inserted as shown in FIG. 1B and the moving support 7 moves in the direction of the arrow. Accordingly, when the movable support 7 moves in the direction of the arrow, the cam end 6A of the cam link 6 is separated from the roller 3C provided at the end of the upward bent end of the link 3, at which time the latch Means for releasing (9) (not shown) and means (not shown) for releasing the trip 8 are provided. In addition, the link 3 is rotated counterclockwise around the rotation joint 3B by the force FB of the return spring 5 to open the fixed contact portion 2A and the movable contact portion 2B of the switch 2. . As described above, the cam end 6A of the cam link 6 disconnects the contact of the roller 3C of the link 3 even during the switch closing operation in response to the release of the trip latch 8. It is called ability. As such, the conventional circuit breaker provides a trip free instant overwrite capability to the circuit breaker by using a two-section link, and by providing such a circuit, the circuit breaker and the fixed contact portion 2A can be used at any time even during a switch closing operation of the circuit breaker. The switch 2 composed of the movable contact portions 2B can be opened.

However, in the conventional trip free mechanism, the trip support function supporting the cam link has to be moved in the direction of the arrow in order to achieve the trip state as described above, so that the trip free function is impossible due to the influence of gravity depending on the mounting direction of the circuit breaker. There was this. Therefore, an object of the present invention is to be able to perform the function of trip free regardless of gravity according to the mounting direction.

Figures 1a, 1b, 1c shows a two-link link-free operation mechanism for a conventional switch assembly,

Figure 1a is a switch open state.

1b is a switch input state.

1C is a trip free operation state diagram.

Figure 2a, Figure 2b, Figure 2c shows a two-link link-free trip mechanism for the switch assembly according to the present invention,

Figure 2a is a switch open state.

Figure 2b is a switch input state.

2C is a trip free operation state diagram.

3 to 6b shows an embodiment of the present invention,

3 is a front view showing the assembly of the switch operating mechanism;

4a and 4b show a switch open state,

4A is a side view of FIG. 3.

4B is an enlarged partial view of FIG. 4A.

Figure 5a, Figure 5b shows the switch in the state,

5A is a side view of FIG. 3.

5B is an enlarged partial view of FIG. 5A;

6A and 6B illustrate a trip free operation state.

6A is a side view of FIG. 3.

6B is an enlarged partial view of 6A.

** description of the symbols for the main parts of the drawings **

11,111: Assembly 12,112: Switch

12A, 112A: Fixed contact 12B, 112B: Mobile contact

13: Link 1 13A, 13B, 14A, 17B, 112C, 113F: Swivel joint

14,118: Link 2 14B, 118A, 125: Roller

15,130: Fixed support 16,116,116A: Return spring

17: Cam Link 17A: Cam End

18: support part 19: trip latch

20: Feeding latch 21,122,122A: Driving spring

113: switch arm link 113A, 113B, 113C: switch lever arm

113D: Connecting rod 113E: Post

113G, 120A: Shaft 114,114A: Fixed rotation joint

115,115A: Fixed support member 117,117A: Connection point

118B: Trip roller 119: Trip latch

119A: Lever 121: input cam

123: arm 124: injection latch

126: trip latch return spring 127: link return spring

128: solenoid 128A: link

129: Lever 131: Support

To achieve the object of the present invention, a two-link link-free trip mechanism for a switch assembly including a switch means capable of switching to a trip or open state and an input state, the trip state being coupled to the switch means or A switch for switching the switch means to an input state; A link 1 composed of a switch lever arm equipped with a movable switch; Means for supporting the link 1 pivotably about a first pivot point for trip free operation and switch contact opening operation; A link 2 having a roller in contact with the cam portion and a trip roller constrained to the trip latch in the input state of the switch; Means for supporting the link 2 rotatably about a second pivot point for a trip free operation and a switch contact opening operation; Means for rotatably mounting the link 2 and connecting the link 2 and the link 1 so as to be pivotable about the second turning point; When the link 2 is moved downward in the switch-in state, when the switch is in the open state, the link 2 is pivoted about the second turning point to separate the cam portion and the roller, and the switch-in state is again switched. Means for contacting the cam portion with the roller and a connecting position; There is provided a two-link link-free trip mechanism for a switch assembly, characterized in that the trip latch restricting rotation of the link 2 rotates so that the roller of the link 2 slides freely on the cam surface. In addition, one end is coupled to one end and the other end is coupled to a switch contact part by mounting a roller at one end and a trip roller contacting the trip latch at the other end to pivot about the rotation axis by releasing the trip latch. And a link 1 formed of a switch lever arm, wherein the switch lever arm is pivotably rotated about a fixed rotational axis between a trip free position at which the switch contact is placed at an input position and a switch trip position at which the switch contact is positioned at an open position. A switch lever arm assembly comprising means for supporting; Means for biasing the switch lever arm to a switch trip position; Means for supporting the link 2; A position for engaging the feeding cam with the roller; Means for pivoting the link lever 1 and link 2 by means of deflecting the switch lever arm at the switch trip position by causing the link 2 to slide freely in the input cam by rotation of the link 2 upon release of the trip latch; A two-link link-free trip mechanism for a switch assembly is provided which comprises means for opening the switch contact irrespective of the position of the input cam. A trip latch return spring for always returning the trip latch to its original position after the trip; Means for supporting the trip latch; Means for supporting the trip latch return spring; A link return spring that always returns the link 2 to its original position after the trip; And means for supporting the link return spring. In addition, it is characterized in that the link lever 2, which has a trip roller that is constrained by the trip latch, and the switch lever arm placed in the switch trip free position.

Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

2A, 2B, and 2C show the entire assembly of the two-stage link-free tripping mechanism according to the present invention, wherein the switch 12 of the assembly 11 includes a fixed contact portion 12A and a movable contact portion 12B. 2A shows that the fixed contact portion 12A and the movable contact portion 12B of the switch 12 are in an open state. The movable contact portion 12B is connected to the link 1 13 by the rotation joint 13B, and the link 1 13 is installed to enable the rotational movement with the rotation joint 13A installed on the fixed support 15. . In addition, the right side of the link 1 (13) and the bend of the link 2 (14) is connected by a rotary joint 14A, the upper end of the link 2 (14) is connected to the support 18 by a rotary joint (17B) A roller 14B for rolling contact motion is connected to the cam end 17A of the cam link 17. And the upper right of the link 1 (13) is connected to the trip latch 19, which restrains the clockwise rotation of the rotation joint (14A) of the link 2 (14), the entire assembly 11 is the link 1 (13) It includes a return spring (16) connected to the drive spring 21 and a drive spring (21) connected to the cam link (17). The driving spring 21 is initially in a tensioned state, and a downward input force F1 is applied to the cam link 17, but the cam link 17 centering on the rotary joint 17B as shown in FIGS. 2B and 2C. Relax after the rotation of. In addition, the return spring 16 is initially relaxed and then returned to an initial relaxed state. At this time, the cam link 17 is initially restricted by rotation of the closing latch 20.

The following describes the operation state of the present invention configured as described above, that is, the switching operation of the circuit breaker to the open state and the closing state.

As shown in FIG. 2A, the circuit breaker is connected to the upper end of the link 2 14 to the cam end 17A of the cam link 17 rotatably connected to the support 18 by the rotary joint 17B. Is in contact with each other, and the fixed contact portion 12A and the movable contact portion 12B of the switch 12 are in an open state. In this state, when the closing latch 20 is released for the operation of inserting the contact portions 12A and 12B of the switch, the cam link 17 descends clockwise about the rotary joint 17B by the input force F1. Is rotated, the link 1 (13) is rotated clockwise around the rotation joint (13A) by the rotational force of the cam link 17 transmitted through the link 2 (14), wherein the link 1 (13) The trip latch 19 provided at the right side of the constrains the lower end of the link 2 14 so that the link 2 14 does not move relative to the link 1 13. And the moving contact part 12B of the switch 12 is injected into the fixed contact part 12A by the rotational force of the link 1 (13). On the other hand, the input force F1 of the drive spring 21 is consumed while rotating the cam link 17, the return spring 16 is tensioned by the rotation of the link 2 (14) and link 1 (13) to return to F2 Will have power.

Next, when the movable contact portion 12B is inserted, and the mechanism assembly 11 is placed in the state shown in Fig. 2B, the switch contact portions 12A and 12B are opened, as shown in Fig. 2C. The opening operation and the trip-free operation of switching to, i.e., the opening operation before the switch contact portions 12A and 12B contact each other, will be described. First, in order to start the switch opening operation, when the trip latch 19 is released, the return energy F2 of the return spring 16 rotates the link 1 13 in the direction of the arrow of FIG. 2C, where the trip latch 19 The roller 14B of the link 2 14, which is freed by the release of), is relatively in sliding contact with the cam end 17A of the cam link 17, and the link 2 14 is centered on the rotary joint 13A. Rotation further increases the rotation of the link 1 (13) to open the switch contacts (12A) (12B). Accordingly, the cam end portion 17A and the roller 14B of the cam link 17 are freely contacted with each other without transmitting force as shown in FIG. 2C, and the switch contact portions 12A and 12B are opened.

Next, the trip free operation will be described later. In this case, the trip free operation is performed by switching the switch contact portion 12A (from the open state as shown in FIG. 2A to the input state as shown in FIG. 2B). Before the 12B) contacts each other, the trip latch 19 is released and converted to a state as shown in FIG. 2C without passing through the closing state. This causes the link 2 14 and the link 1 13 to rotate, respectively, by the rotation of the cam link 17 in the open state, and the latching of the link 1 13 while moving to the position where the movable contact portion 12B is inserted. (20) is released to enable link 2 (147) to rotate clockwise. In addition, the return energy F2 of the return spring 16 acts so that the link 1 13 rotates counterclockwise so that the movable contact portion 12B is moved back to the open position. As described above, the present invention uses only two links except the cam link to perform the trip-free operation regardless of the closing operation of the moving contact unit and the positions of the respective links.

On the other hand, Figures 3 to 6 show a preferred embodiment of the present invention, Figure 3 is a front view showing an assembly of a general switch operating mechanism, Figures 4a and 4b is a trip-free two-link link switch according to the present invention An embodiment of the actuator is shown. The assembly 111 also includes a switch 112 having a fixed contact 112A and a movable contact 112B in an open state. In addition, the movable contact portion 112B of the switch 112 is connected to the switch lever arm 113A of the switch arm link 113 through the rotation joint 112C, wherein the switch lever arm 113A is shown in FIG. 2A, FIG. 2b, Fig. 2c which corresponds schematically to link 1 13 described in connection with it. The switch lever arm 113A is connected to the fixed support members 115 and 115A by the fixed rotation joints 114 and 114A, and the connection points 117 and 117A to which the return springs 116 and 116A are connected. The opposite sides of the return springs 116 and 116A are connected to the fixed support members 115 and 115A. Along with this, a roller 118A is mounted at the upper end of the link 2 118, and a trip roller 118B is mounted at the lower end of the roller 118A, wherein the trip roller 118B is initially opened and closed. In contact with trip latch 282. In addition, the switch lever arm 113A is connected to the connecting rod 113D by welding, and another two switch lever arms 113B and 113C are connected to the connecting rod 113D, and the switch lever arm 113B. And link 2 118 are rotatably connected via the rotary joint 113E upon switching to the open state. That is, in the case of a three-pole circuit breaker system, the connecting rod 113D simultaneously transmits an input motion or an open motion to three switch lever arms 113A, 113B, and 113C. Also, as shown in FIGS. 4A and 4B, the input cam 121 is rotatably fixed to the shaft 120, and the input cam 121 has a plurality of arcs each having a different radius from the shaft 120 which is the center of rotation. It has a combination shape. The roller 118A of the link 2 118 is coupled to the recessed area 121A of the input cam 121, which is a detailed view of FIG. 2A, and the driving springs 122 and 122A are fixed support portions ( Both ends are connected to an arm 123 connected with the input cam 121 at the rotation center of the shaft 120A and the input cam 121 fastened to 130, and the return springs 116 and 116A are fixed. Both ends are connected to the members 115 and 115A and the switch arm link 113, respectively, to give a return force. On the other hand, the roller 125 is in contact with the input latch 124 is in contact with the input cam 121, the input latch 124 is connected to the fixed support 130 by a rotary joint 124A in the initial open state By restraining the rotational force in the clockwise direction generated by the driving springs 122 and 122A, FIGS. 3, 4A and 4B show a state in which the driving springs 122 and 122A are tensioned. In addition, the trip roller 118B mounted on the shaft 120 of the link 2 118 is contacted by the trip latch 119 rotatably mounted on the shaft 120 installed on the switch lever arm 113B. It is to restrain the clockwise rotational force of the link 2 (118) in the state, the link latch 119 is firmly connected to the link (not shown) to enable the trip to the lever (119A). When the trip latch 119 is rotated clockwise to release the contact with the trip roller 118B, the link 2 118 rotates clockwise. 3 and 4a and 4b, when the switch 112 is moved or is in the closed state, the switch lever arm is always in contact with the trip roller 118B when the switch 112 is in the closed state. The trip latch return spring 126 is connected to the post 113D of 113B. A shaft 113F is also mounted to the switch lever arm 208B to prevent further rotation in the counterclockwise direction by the stretched trip latch return spring 126. And the link return spring 127 is tensioned so that the link 2 (118) is in the same position as in Figures 4a and 4b is connected to the supporter 131 located in the fixed support (130). The switch lever arm 113B is link 1 here.

The following describes the closing and opening operation of the above embodiment.

First, FIGS. 4A and 4B show the assembly 111 in which the switch 112 is opened by the tensioned driving springs 122 and 122A, and the solenoid 128 is electrically driven to link 128A. Pull upwards. As a result, the left free end of the lever 129 moves upward and rotates clockwise around the rotation joint 124A together with the closing latch 124. This clockwise rotation separates the contact of the input latch 124 from the roller 125 mounted on the input cam 121, which is caused by the torque stored in the tensioned driving springs 122 and 122A. 121 rotates freely clockwise. The roller 118A mounted on the link 2 118 makes rolling contact motion along the surface of the input cam 121. When the input cam 121 starts to rotate in the clockwise direction, the roller 118A is clouded to the highest point of the input cam 121 and the roller 118A is pushed downward. Since the lower end of the link 2 118 is restricted from being rotated by the trip latch 119, the switch arm link 113 can rotate clockwise with respect to the fixed rotation support. Accordingly, the left side of the link 2 118 or the switch arm link 113 is moved upward to move the movable contact 112B of the switch 112 to the closing position to reach the stationary contact 112A, as shown in FIGS. 5A and 5B. It will be in the state of completion of input.

5A and 5B, the switch contact portions 112A and 112B are inserted, and the tension force of the driving springs 122 and 122A is released, thereby rotating the trip latch 119 clockwise for the opening operation. The trip latch 119 and the trip roller 118B are separated by a link (not shown). This causes the link 2 118 to rotate clockwise by the contact force acting between the feed cam 121 and the roller 118A and the force of the tensioned return springs 116 and 116A, and the feed cam 121 surface. The sliding motion of the upper roller 118A causes the switch arm link 113 to not receive any restraining force. As described above, the return springs 116 and 116A generate the switch opening torque in the counterclockwise direction to the switch arm link 113 to be in an open state as shown in FIGS. 6A and 6B. 6A and 6B show that the contact between the roller 118A and the input cam 121 is freed by the rotation of the link 2 118, and the switch 112 is moved by the force of the return springs 116 and 116A. The left side of the switch link arm 113 to which the contact portion 112B is coupled is pulled downward, whereby the switch 112 is placed in an open contact state, wherein the roller 118A is the input cam 121. It is easy to slide to the upper side along the surface of the. Such an open contact operation can be started at any time not only after the closing operation but also during the switch closing operation of the instrument. When the restraint of the trip latch 119 is released, the switch contact portions 112A and 112B are always in an open state, which is called a trip free operation, and the present invention provides a two-link trip free position operating mechanism. will be. On the other hand, the present invention is not limited to the embodiments as described above, it can be modified in various forms, but the scope of the present invention is limited only by the claims.

As such, the present invention is capable of performing a trip-free function regardless of gravity depending on the mounting direction of the circuit breaker by removing the link member to be swiveled by gravity to achieve a trip state, thereby improving the performance and reliability of the device. Not only can this be improved, the energy required for tripping the switch can be reduced by more than 40%, which also has the effect of reducing the energy by more than 40% for the switch to be in the closed state.

Claims (4)

2. A two-link link-free trip mechanism for a switch assembly comprising a switch means capable of switching to a trip or open state and an input state, comprising: a switch coupled to the switch means to switch the switch means to the trip state or the input state; Wow; A link 1 composed of a switch lever arm equipped with a movable switch; Means for supporting the link 1 pivotably about a first pivot point for trip free operation and switch contact opening operation; A link 2 having a roller in contact with the cam portion and a trip roller constrained to the trip latch in the input state of the switch; Means for supporting the link 2 rotatably about a second pivot point for a trip free operation and a switch contact opening operation; Means for rotatably mounting the link 2 and connecting the link 2 and the link 1 so as to be pivotable about the second turning point; When the link 2 is moved downward in the switch-in state, when the switch is in the open state, the link 2 is pivoted about the second turning point to separate the cam portion and the roller, and the switch-in state is again switched. Means for contacting the cam portion with the roller and a connecting position; And a means for allowing the roller of the link 2 to slide freely on the cam surface by rotating the trip latch that restricts the rotation of the link 2. One end is coupled and the other end is coupled to the switch contact portion in the link 2 which rotates about the rotation axis by releasing the trip latch by mounting the roller at one end and contacting the trip latch at the other end. And a link 1 formed of a switch lever arm, wherein the switch lever arm is pivotably pivoted about a fixed rotational axis between a trip free position in which the switch contact part is placed in an open position and a switch trip position in which the switch contact part is placed in an open position. A switch lever arm assembly comprising means for; Means for biasing the switch lever arm to a switch trip position; Means for supporting the link 2; A position for engaging the feeding cam with the roller; Means for pivoting the link lever 1 and link 2 by means of deflecting the switch lever arm at the switch trip position by causing the link 2 to slide freely in the input cam by rotation of the link 2 upon release of the trip latch; 2. A two-link link-free actuating mechanism for a switch assembly, characterized in that it comprises means for opening a switch contact regardless of the position of the input cam. 3. The apparatus of claim 2, further comprising: a trip latch return spring for always returning the trip latch to its original position after the trip; Means for supporting the trip latch; Means for supporting the trip latch return spring; A link return spring that always returns the link 2 to its original position after the trip; And a means for supporting said link return spring. 3. The two-link link-free actuation mechanism for switch assembly according to claim 2, wherein a link lever having a trip roller constrained by the trip latch and a switch lever arm positioned at the switch trip free position are connected.