KR19990034356U - Push Rod Structure of Vacuum Circuit Breaker - Google Patents

Abstract

The present invention relates to a push rod structure of a vacuum circuit breaker. A push rod reciprocating up and down is smoothly coupled to a main circuit part by a change lever that is rotated when the vacuum circuit breaker is turned on and off. The contact is to be connected and disconnected smoothly.

To this end, the present invention is coupled to the main circuit portion (3) and the vacuum interrupter (6) having a fixed contact (9) and a movable contact (10) installed therein, and is coupled to the lower portion of the main circuit portion (3) suitable for contact A push rod 13 for applying a pressing force, a regulator 19 surrounding the outer periphery of the stud 18 coupled to the push rod 13, and a coil spring 20 provided at the outer periphery of the regulator 19; A spring cap (21) and a joint (24) having a hinge pin (25) coupled to a lower portion of the outer periphery of the regulator (19) and coupled to a change lever (12) at the outer periphery; The upper portion of the push rod 13 is hinged to the movable terminal 11, the outer peripheral portion of the regulator 19 and the inner circumferential surface of the coil spring 20 is to be coupled to the sliding engagement.

Description

Push Rod Structure of Vacuum Circuit Breaker

The present invention relates to a vacuum circuit breaker, and more particularly, to a push rod structure of a vacuum circuit breaker.

In general, a vacuum circuit breaker is a circuit and device protection device that quickly disconnects a circuit by arcing a vacuum generated in a vacuum container during opening and closing of a normal load and breaking an accident current.

As shown in FIG. 1, the vacuum circuit breaker includes a cradle 1, a trolley portion 2 drawn in and out while being reciprocated along an upper surface of the cradle 1, and the trolley portion 2. It is composed of a main circuit portion 3 and an auxiliary device coupled to the rear, and each of the components is surrounded by a switchboard (4) installed on the outside.

The main circuit part 3 is provided with an energizing part, an insulating part, and an arc extinguishing device. The energizing part is a peripheral element constituting a contact. The contact is composed of a movable contact and a fixed contact, and the movable contact is a machine of a vacuum circuit breaker. When the vacuum circuit breaker is in the 'closed' state in conjunction with the movable part, the fixed contact point and the movable contact point are in contact, and sufficient pressure is applied to the movable contact point so as not to suppress the current flowing through the circuit by the contact resistance. In this case, the movable contact should be separated at the proper speed to the proper breaking distance.

In addition, the insulating part has an insulating function and is made of an epoxy mold or a BMC resin.

The contact resistance is larger than other portions in the contact portion of the conductor, so that heat may be generated. To reduce the contact resistance, the contact resistance may be minimized by reducing or contacting the gap between the contacts.

In addition, the extinguishing device extinguishes the arc generated at the time of contact opening and closing of the fault current of the vacuum circuit breaker.

The trolley portion 2 refers to a mechanical mechanism for opening and closing the contact of the vacuum circuit breaker, and corresponds to all the operating devices configured on the front side of the vacuum circuit breaker.

In addition, the auxiliary device is an accessory device for operating the vacuum circuit breaker normally, and corresponds to a control device, an interlock device, a drawing device, and a drawing device.

As shown in FIG. 2, the main circuit part 3 includes a mold housing 5, a vacuum interrupter 6 installed in the mold housing 5, and an upper terminal coupled to the vacuum interrupter 6. (7), a movable contact (10) provided in the vacuum interrupter (6) so as to be connected to and separated from the fixed contact (9) provided in the vacuum interrupter (6), and a movable terminal (11) fixed to the movable contact (10). ), A push rod 13 coupled to the lower portion of the movable terminal 11 and coupled with the other end and the lower portion of the change lever 12 hinged in the cart 2 to give an appropriate pressing force to the contact point; The lower portion of the movable terminal 11 is coupled, the clamp 14 to which the upper portion of the push rod 13 is coupled, and the lower terminal 8 positioned on the upper portion of the push rod 13 and coupled to the mold housing 5. ), And one end is coupled to the clamp 14, the other end is composed of a shunt (Shunt) 15 is coupled to the lower terminal (8).

The fixed contact 9 installed in the vacuum interrupter 6 is coupled to the upper terminal 7, and the movable contact 10 installed in the vacuum interrupter 6 includes the movable terminal 11, the clamp 14, and the shunt. It is connected to the lower terminal 8 via (15).

The main circuit portion of the conventional vacuum circuit breaker configured as described above fixes the upper and lower terminals 7 and 8 to the mold housing 5 of the main circuit portion 3, and the upper terminal 7 and the vacuum interrupter 6 and the clamp. 14 and the clamp 14 are inserted into the mold housing 5 in a state where each component such as a shunt 15 having one end coupled thereto.

After each of the inserted parts in the mold housing 5, the push rod 13 is inserted through the lower portion of the mold housing 5 to clamp the lower portion of the movable terminal 10 of the vacuum interrupter 6 The upper portion of the push rod 13 is coupled to the 14, and the other end of the shunt 15 is fixed to the lower terminal 8.

The lower portion of the movable terminal 11 fixed to the lower portion of the movable contact 10 installed in the vacuum interrupter 6 is wrapped in a vacuum state by a bellows (not shown), and hinged in the trolley portion 2. Since the other end of the change lever 12 and the push rod 13 are coupled, the movable contact 10 installed in the vacuum interrupter 6 is reciprocated by the push rod 13 up and down by the rotated change lever 12. ) And the fixed contact 9 are connected and disconnected, so that power is supplied to and disconnected from the vacuum circuit breaker, and the vacuum circuit breaker is operated and stopped.

As described above, the push force is transmitted to the movable terminal 11 in a linear motion by the rotational force of the change lever 12 hinged in the trolley portion 2, and when the vacuum circuit breaker is put in, a push force is applied between the contacts. 3 and 4, the rod 13 has a threaded portion 16 formed to be coupled to the clamp 14 to be connected to the movable terminal 11 at one end of the push rod 13, and the push. A stud 18 coupled to a space groove 17 opened at a lower portion of the rod 13, a regulator 19 surrounding the outer periphery of the stud 18, and an outer peripheral portion of the regulator 19. Cylindrical coil spring 20 and the circular spring cap 21 is installed in the, and formed on the surface of the spring cap 21 in contact with the inner peripheral surface of the coil spring 20 to prevent the coil spring 20 from flowing Being installed under the plurality of embossing 22 and the spring cap 21 Spacer 23 which maintains a constant space | interval, the jointment 24 which is located below the spacer 23, and couples to the outer periphery of the regulator 19, and the outer periphery of the jointment 24; A hinge pin 25 formed at the coupling lever 12 coupled to the other end of the change lever 12 and fastened to the lower portion of the stud 18 to prevent each component coupled to the stud 18 from being separated from the push rod 13. It consists of the washer 26 and the nut 27 which become.

In the push rod structure of the conventional vacuum circuit breaker configured as described above, the regulator 19 is coupled to surround the outer periphery of the stud 18 coupled to the space groove 17 of the push rod 13, and the outer circumference of the regulator 19 is provided. The spring cap 21, the coil spring 20, and the spring cap 21 are inserted in the edge thereof, and then the spacer 23 is coupled to the lower portion of the lower spring cap 21, and then jointed below the spacer 23. When the cement 24 is coupled, the washer 26 and the nut 27 are fastened to the bottom of the stud 18.

As described above, when the components are completed to the push rod 13, the push rod 13 is coupled to the mold housing 5 of the main circuit portion 3, that is, the push rod 13 is held by the mold housing ( When the upper portion of the push rod 13 is in contact with the clamp 14 by inserting the lower portion of 5), the clamp 14 is fixed and then the push rod 13 is rotated so that the threaded portion 16 of the push rod 13 is rotated. Is coupled to the clamp 14, the upper end of the movable terminal 11 and the push rod (13).

When the coupling of the push rod 13 to the main circuit part 3 is completed, the shunt 15 is fixed to the lower terminal 8, and the hinge pin 25 and the change lever formed on the outer circumferential edge of the joint 24. The other end of (12) is combined.

At this time, the gap between the fixed contact 9 and the movable contact 10 installed in the vacuum interrupter 6 should be kept constant. If the gap is wide, the contact is not connected. If the gap is small, the contact is sufficiently separated. Since the joint 24 is tightened and released, the gap between the contacts is kept constant.

When the change lever 12 hinged to the trolley 2 is rotated and placed in the closing position while the gap between the contacts is kept constant, that is, one end of the change lever 12 is rotated to the lower side of the vacuum circuit breaker. , The other end of the change lever 12 hinged with the joint 24 of the push rod 13 is rotated to the upper side of the vacuum circuit breaker.

The other end of the change lever 12 rotated to the upper side moves the joint 24 to the upper side to compress the coil spring 20, and the push rod 13 is also moved to the upper side, so that the push rod 13 and The connected movable contact 10 is also moved to the upper side and the movable contact 10 of the movable terminal 11 is connected to the fixed contact 9 fixed in the vacuum interrupter 6 so that the upper terminal 7 and the lower terminal 8 are connected. Is energized between

On the other hand, the compressed force of the coil spring 20 acts as a pressing force for pushing the movable contact 10 to the fixed contact (9) side to minimize the contact resistance generated between the two contacts.

Then, when the change lever 12 is rotated and placed in the blocking position, that is, one end of the change lever 12 is rotated to the upper side of the vacuum circuit breaker, and the change lever hinged to the joint 24 of the push rod 13. The other end of (12) is rotated to the lower side of the vacuum circuit breaker.

The other end of the change lever 12 moves the jointment 24 to the lower side to return the coil spring 20 to its original position, and the push rod 13 also moves to the lower side. The contact 10 is also moved to the lower side, so that the stationary contact 9 and the movable contact 10 installed in the vacuum interrupter 6 are separated, so that the upper terminal 7 and the lower terminal 8 are disconnected to the vacuum breaker. Power is cut off.

However, the push rod structure of the conventional vacuum circuit breaker has a large amount of material loss because the contact load decreases when the vacuum circuit breaker is used for a long time, so that the production cost is increased and the working time when the push rod is replaced. There is a problem that the productivity is lowered because the workability is poor.

In addition, since the coil spring is supported only by the embossing of the spring cap, there was also a problem that the coil spring is twisted when compressed and tensioned by the jointment.

The present invention has been made in order to solve the above problems, the push rod reciprocating up and down in accordance with the change lever rotated when the vacuum circuit breaker is inserted, shut off smoothly coupled to the main circuit portion, fixed by the push rod The purpose is to make the contact and movable contact smoothly connected and disconnected.

In order to achieve the above object, the present invention is a vacuum interrupter is coupled to the main circuit portion is provided with a fixed contact and a movable contact therein, a push rod coupled to the lower portion of the main circuit portion to give an appropriate pressing force to the contact, and the push rod A joint wrapper formed with a regulator surrounding the outer periphery of the stud coupled therein, a coil spring and a spring cap installed at the outer periphery of the regulator, and a hinge pin coupled to a lower portion of the outer periphery of the regulator and coupled to a change lever at the outer periphery. In consisting of; An upper portion of the push rod is hingedly coupled to the movable terminal, and a push rod structure of the vacuum circuit breaker is provided so that the outer circumferential portion of the regulator and the inner circumferential surface of the coil spring are slidably coupled to each other.

1 is a side view showing a general vacuum circuit breaker.

Figure 2 is a cross-sectional view showing a conventional main circuit portion of the vacuum circuit breaker.

Figure 3 is an exploded perspective view showing a conventional push rod structure of the vacuum circuit breaker.

Figure 4 is a cross-sectional view showing a state in which a conventional push rod of the vacuum circuit breaker is coupled.

Figure 5 is an exploded perspective view showing the present invention push rod structure of the vacuum circuit breaker.

Figure 6 is a cross-sectional view showing a state in which the push rod of the present invention of the vacuum circuit breaker is coupled.

Figure 7 is a perspective view of the present invention bulb guide and supporter of the vacuum circuit breaker.

Explanation of symbols for main parts of the drawings

101: bulb guide 102: supporter

103: combined hole 104: long hole

105: fastener 106: hinge

107: head 108: clip

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 5 to 7.

Since the vacuum circuit breaker has been mentioned in the conventional configuration, overlapping portions will be omitted, and the same reference numerals will be used for the same structure.

Figure 5 is an exploded perspective view showing the present invention push rod structure of the vacuum circuit breaker, Figure 6 is a cross-sectional view showing a state of the present invention push rod of the vacuum circuit breaker, Figure 7 shows the present invention bulb guide and supporter of the vacuum circuit breaker As a perspective view, in the present invention, the vacuum interrupter 6 is coupled to the main circuit part 3, and the fixed contact 9 and the movable contact 10 are provided in the vacuum interrupter 6, and a pressing force appropriate for the contact point is provided. Push rod 13 is coupled to the lower portion of the main circuit portion (3) to give.

The stud 18 is coupled to the space groove 17 formed in the lower portion of the push rod 13, the regulator 19 surrounding the outer periphery of the stud 18 is coupled, the regulator 19 A coil spring 20 and a spring cap 21 are installed at the outer circumference, and are coupled to a lower portion of the outer circumference of the regulator 19 and have a hinge pin 25 coupled to the change lever 12 at the outer circumference. The joint 24 is provided.

The upper portion of the push rod 13 is hinged to the movable terminal 11, the outer peripheral portion of the regulator 19 and the inner circumferential surface of the coil spring 20 is slidingly coupled in contact.

A coupling hole 103 is formed at an upper portion of the push rod 13, a bulb guide 101 is coupled to a lower terminal 8 so that the upper portion of the push rod 13 is inserted, and the bulb guide ( A long hole 104 is formed in 101.

The movable terminal 11 and the supporter 102 are coupled to be inserted into the bulb guide 101, the fastening hole 105 is formed in the supporter 102, and the coupling hole 103 and the long hole 104. ) And a hinge 106 is fitted when the fastening hole 105 coincides.

One end of the hinge 106 has a head 107 is formed so as not to be caught in the long hole 104 of the bulb guide 101, the other end of the hinge 106, the coupling hole 103 and the long hole 104 And clip 108 is fitted to prevent the release of the hinge 106 inserted into the fastening hole 105.

The cross section of the coil spring 20 is formed in a square to reduce the size of the conventional cylindrical coil spring 20 while maintaining the same elastic force as the conventional, the outer circumferential surface of the spring cap 21 is formed in a polygon.

The gap (amount of wiper) between the joint 24 and the washer 26 coupled to the outer periphery of the regulator 19, that is, the fixed contact 9 and the movable contact 10 installed in the vacuum interrupter 6 is Constantly adjusted by the coil spring 20, the distance (wiper amount) between the fixed contact (9) and the movable contact (10) is a vacuum interrupter (6) even in the state that the contact of the coil spring 20 load is consumed This is to maintain the load required.

The operation of the present invention configured as described above is as follows.

First, the regulator 19 is coupled to surround the outer periphery of the stud 18 coupled in the space groove 17 of the push rod 13, and the spring cap 21 and the coil at the outer periphery of the regulator 19. The spring 20 and the spring cap 21 is inserted, and then the spacer 23 is coupled to the lower portion of the lower spring cap 21, and the hinge hinged to the change lever 12 below the spacer 23. After coupling the joints 24 having the pins 25 formed therein, the washers 26 and the nuts 27 are coupled to the lower ends of the studs 18 in contact with the lower surfaces of the regulators 19.

At this time, by using a coil spring 20 having a square cross-section, it is possible to reduce the length of the overall push rod 13, while maintaining the same elastic force as the conventional while reducing the size of the conventional cylindrical coil spring 20, the spring cap Since the outer circumferential surface shape of the 21 is formed in a polygon, the spring cap 21 can be smoothly coupled to the outer circumferential edge of the regulator 19.

The coil spring 20 is coupled to the outer circumferential edge of the regulator 19 while the coil spring 20 slides while the outer circumferential edge of the regulator 19 and the inner circumferential surface of the coil spring 20 are in contact with each other, so that the coil spring 20 is connected to the regulator 19. Since it is smoothly compressed and stretched along the outer circumference of the), between the joint 24 and the washer 26 coupled to the outer circumference of the regulator 19, that is, the fixed contact 9 and the movable contact provided in the vacuum interrupter 6 The interval (the amount of wipers) between the 10 is constantly adjusted.

As described above, when the coupling of the components to the push rod 13 is completed, the push rod 13 is grasped and pushed from the bottom of the main circuit unit 3 to be coupled, and the lower terminal of the main circuit unit 3 ( The supporter 102 coupled with the movable terminal 11 is inserted from the upper portion of the bulb guide 101 coupled to 8), and the push rod (from the bottom) is inserted into the bulb guide 101 into which the supporter 102 is inserted. The top of 13) is inserted.

A coupling hole 103 is formed in an upper portion of the push rod 13 inserted into the bulb guide 101, a long hole 104 is formed in the bulb guide 101, and a fastening hole in the supporter 102. Since the coupling hole 103 and the long hole 104 and the fastening hole 105 coincide with each other, the hinge terminal 106 is fitted to the movable terminal 11 of the push rod 13 and the vacuum interrupter 6. Connect with

At this time, the head portion 107 formed at one end of the hinge 106 is caught by the long hole 104 of the bulb guide 101, and the clip 108 is fitted at the other end to prevent the hinge 106 from being separated.

Since the push rod 13 and the movable terminal 11 are firmly coupled to the main circuit part 3 by a pin coupling method, the hinge pin 25 of the joint 24 is coupled to the lower part of the push rod 3. When the change lever 12, which is hinged and is placed in the input position, that is, one end of the change lever 12 is rotated to the lower side of the vacuum circuit breaker, and the other end is rotated about the hinge to the upper side of the vacuum circuit breaker.

The joint 24 coupled to the other end of the rotated change lever 12 is moved to the upper side of the vacuum circuit breaker by the change lever 12 so that the coil spring 20 having a rectangular cross section is compressed and the push rod ( 13) is also moved to the upper side.

The movable terminal 11 coupled to the upper portion of the push rod 13 moved to the upper side is also moved to the upper side along the push rod 13 and fixed to the upper terminal 7 in the vacuum interrupter 6. Since the movable contact 10 coupled to the movable terminal 11 moving upward is connected to the fixed contact 9, one end is coupled to the clamp 14 coupled to the lower portion of the movable terminal 11, and the other end is connected to the lower terminal. Since the energization is made between the upper terminal 7 and the lower terminal 8 by the shunt 15 coupled to (8), the vacuum circuit breaker is operated.

When the change lever 12 is placed in the blocking position, the joint 24 coupled to the other end of the change lever 12 rotated to the lower side of the vacuum breaker is moved to the lower side of the vacuum breaker, and the coil spring 20 is moved. At the same time as the original position is returned, the push rod 13 is also moved to the lower side.

Since the movable terminal 11 coupled to the upper portion of the push rod 13 moved to the lower side is also moved to the lower side along the push rod 13, the movable contact 10 at the fixed contact 9 installed in the vacuum interrupter 6. The vacuum breaker is stopped because the separated circuit is disconnected between the upper terminal 7 and the lower terminal 8.

As described above, the present invention by forming a cross-sectional shape of the coil spring coupled to the outer periphery of the regulator coupled to surround the stud outer peripheral surface of the push rod in a cylindrical shape, the effect of the coil spring, that is, the elastic force is kept the same By reducing the size of the coil spring, the overall size of the push rod is reduced, which significantly reduces the size of the product, making it compact and reducing the occupied space.

In addition, since the inner circumferential surface of the coil spring is coupled to the outer circumferential edge of the regulator while sliding, it is prevented from twisting the coil spring that is continuously compressed and tensioned by a change lever that is rotated when the vacuum circuit breaker is turned on and off. There is also an effect.

In addition, since the movable terminal of the vacuum interrupter and the upper portion of the push rod are coupled in a pin coupling manner, the push rod and the movable terminal are easily coupled, and the movable terminal and the push rod are impacted by the shock generated when the vacuum interrupter is inserted and blocked. In addition to preventing the separation, there is also an effect of improving the closing and closing speed of the vacuum circuit breaker.

Claims (5)

A vacuum interrupter coupled to the main circuit unit and having a fixed contact and a movable contact therein; a push rod coupled to the lower part of the main circuit unit to give an appropriate pressing force to the contact; a regulator surrounding the outer periphery of the stud coupled to the push rod; A joint spring having a coil spring and a spring cap installed at an outer circumferential edge of the regulator, and a hinge pin coupled to a lower portion of the outer circumferential edge of the regulator and coupled with a change lever at the outer circumferential edge; An upper portion of the push rod is hinged to the movable terminal, the push rod structure of the vacuum circuit breaker, characterized in that the outer circumferential portion of the regulator and the inner circumferential surface of the coil spring in a sliding contact state. The method of claim 1, Forming a coupling hole in the upper portion of the push rod, and forms a long hole in the bulb guide coupled to the lower terminal so that the upper portion of the push rod is inserted, and forming a fastening hole in the supporter coupled to the movable terminal to be inserted into the bulb guide , Push rod structure of the vacuum circuit breaker, characterized in that the hinge is fitted when the coupling hole and the long hole and the fastening hole is fitted. The method of claim 2, A push rod structure of a vacuum circuit breaker, characterized in that a head portion is formed at one end of the hinge so as to be caught by the long hole of the bulb guide, and a clip is inserted at the other end to prevent detachment of the hinge. The method of claim 1, Push rod structure of a vacuum circuit breaker, characterized in that the cross section of the coil spring is square. The method of claim 1, The outer circumferential surface of the spring cap is a push rod structure of a vacuum circuit breaker, characterized in that formed in a polygon.