KR100298332B1 - safety device for vacuum circuit breaker - Google Patents

Abstract

PURPOSE: A safety apparatus of a vacuum breaker is provided to reduce the accident occurring on a high-voltage switchboard by preventing the incoming and outgoing of a trolley. CONSTITUTION: A shaft(104) is fixed to a worm wheel(103) of a worm gear and rotates according to the rotation of a worm(102). A guide is fixed to a switchboard and has a vertical large hole(108). A lever(105) is fixed to the shaft(104) and moves a trolley by inserting a projection(106) into the large hole(108) of the guide(107) when the shaft(104) rotates. A link(110) is connected to a cam(112) and a protruding unit(111) rotated by the shaft(104) and moves up and down according to the rotation of the cam(112). An operation unit(113) and an operation bar(114) are installed on an upper portion of the link(110) and prevent the injection of the trolley. An operation shaft(115) rotates together with a changing lever.

Description

Safety device for vacuum circuit breaker

The present invention relates to a vacuum circuit breaker, and more particularly to a safety device of the 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 is composed of a cradle 1, a main circuit part 3, a bogie part 2, and an auxiliary device, and each of the components is provided by a switchboard 10 installed at an outer side thereof. Wrapped

The main circuit part 3 is provided with a current interrupting part, an insulating part, and an arc extinguishing device. The current interrupting part is a peripheral element constituting a contact, and the contact is composed of a movable contact and a fixed contact. When the vibration breaker is in the 'closed' state in conjunction with the machine moving 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. At the time of shutoff, the movable contact is to be separated to a suitable breaking distance at a suitable speed.

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

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 described above, when the trolley portion 2 of the vacuum circuit breaker is pulled in and out, the ground switch 9 is installed in the switchboard 10 to ground the residual current on the load side, or the ground switch 9 is inputted. The entrance and exit of the municipal balance unit 2 is prevented by a safety device. The safety device includes a base 4 coupled to the lower portion of the balance unit 2 and the balance unit as shown in FIG. 2. The guide member 5 coupled to the side of the (2) and the guide member 5 and one side contact with the guide member 5 so as to rotate about the hinge 8 by the guide member 5 to the outer surface of the cradle (1) Ground switch 9 when the balance unit 2 is inserted and shut down while being reciprocated up and down by a hinged lever plate 6 and a lever plate 6 coupled to the other side of the lever plate 6 and rotated. Is composed of a lever (7) which prevents operation.

In the conventional vacuum circuit breaker configured as described above, the guide member 5 coupled to the side of the trolley portion 2 when the trolley portion 2 is drawn toward the vacuum circuit breaker side along the cradle 1 also has a vacuum circuit breaker along the trolley portion 2. Is moved to the rear side.

When the cart 2 moves to the vacuum circuit breaker as described above, the guide member 5 of the cart 2 pushes the lever plate 6 hinged to the outer surface of the cradle 1 and the lever plate 6. Is rotated about the hinge 8 while being pushed by the guide member 5, wherein the combined lever 7 of the lever plate 6 moves upwards of the vacuum circuit breaker as shown in solid line in FIG. 2B. do.

Therefore, since the ground switch 9 is fixed by the lever 7 which is moved upward, it cannot be operated.

When the cart 2 is pulled out, the guide member 5 of the cart 2 also moves along the cart 2 so that the lever plate 6 pushed by the guide member 5 is rotated. When the lever 7 coupled to the lever plate 6 is moved to the lower side of the vacuum circuit breaker, the ground switch 9 does not operate when the lever 7 is moved. .

In addition, when the ground switch 9 is operated in the state in which the cart 2 is pulled in and out, that is, in the state in which the cart 2 is stopped, the current remaining on the load side becomes the ground switch 9. Because of the grounding, safety accidents due to residual current are prevented.

However, the safety device of such a conventional vacuum circuit breaker has a problem that a safety accident may occur because the ground switch can be easily input by the immature or mistaken operation of the operator during the introduction and withdrawal of the loan.

In addition, since the ground switch is operated by a lever coupled to the guide plate and the hinge plate pivoted about the hinge of the balance unit, when the lever plate is loosely assembled, the operation accuracy of the ground switch is lowered and the guide plate and the lever plate rotated by the guide member. Since the distance to the member must be precisely adjusted, there is also a problem in that workability is not easy to work.

The present invention has been made in order to solve the above problems, to prevent the introduction of the balance portion during the introduction or withdrawal of the balance portion of the vacuum circuit breaker and to prevent the introduction and withdrawal of the balance portion when the balance portion is introduced or the ground switch is input The purpose is to prevent ground faults and safety accidents that may occur in high-voltage switchboards.

In accordance with an embodiment of the present invention for achieving the above object is fixed to the worm wheel of the worm gear installed in the trolley portion and the axis rotates according to the rotation of the worm, a guide having a vertical long hole fixed to the switchboard, and A lever fixed to the shaft and allowing the bogie to move as the projection is inserted into the slot of the guide when the shaft rotates, a link between the cam and the protrusion which rotates by the shaft to move up and down according to the rotation of the cam; An operating part and an operating rod installed at an upper part of the upper part of the upper part of the upper part to prevent the introduction of the balance part, and to prevent the introduction of the balance part; The vacuum difference is composed of a fourth lever is hinged to the third lever and the fourth lever that restrains the rotation of the worm when the balance portion is inserted to prevent the balance portion from moving The safety of the machine is provided.

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

Figure 2a is an exploded perspective view showing a safety device of a conventional vacuum circuit breaker.

Figure 2b is an operating state diagram showing a state in which the safety device of the conventional vacuum circuit breaker is operated.

Figure 3 is a perspective view showing a safety device of the present invention vacuum circuit breaker.

Explanation of symbols for main parts of the drawings

101: worm gear 104: shaft

105: lever 106: projection

107: Guide 110: Link

112: cam 116: coupling hole

117: pin 118: the first lever

119: second lever 120: third lever

121: fourth lever 122: fifth lever

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

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 3 is a perspective view showing a safety device of the vacuum circuit breaker of the present invention, the present invention is a cradle (1), the cart portion (2) that is drawn in and out while reciprocating along the cradle (1), and the cart portion (2) The main circuit unit 3 coupled to the rear of the), the base 4 coupled to the lower portion of the trolley portion 2, the switchgear 10 installed to surround the respective parts, and the switchgear 10 It is composed of a grounding switch (9) installed in the ground and for grounding the residual current on the load side.

It is provided with a loan unit withdrawal, withdrawal means for the introduction and withdrawal of the loan unit (2), and a loan unit prevention means for preventing the introduction of the loan unit (2) when the withdrawal, withdrawal of the loan unit (2) When the balance unit 2 is inserted, the balance unit is provided with a means for preventing the introduction and withdrawal of the balance unit 2 and the balance unit when the ground switch 9 is inserted. The second loan-bearing means for preventing the withdrawal and withdrawal of 2) is provided.

In the trolley portion inlet and outlet means, a worm gear 101 composed of a worm 102 and a worm wheel 103 is installed in the base 4 of the trolley portion 2, and the worm wheel of the worm gear 101 is provided. The shaft 104 which is rotated by the rotational force of the worm 102 is fixed to the 103, and the lever 105 that is rotated by the shaft 104 is hinged to both ends of the shaft 104, respectively.

The protrusions 106 are coupled to one end of the pivoting lever 105, and guides 107 are respectively provided on both sides of the inner surface of the switchboard 10, and the protrusions 106 are moved to the respective guides 107. A long hole 108 for guiding the direction is formed.

The trolley | bogie insertion prevention means has the bracket 109 couple | bonded with the upper end surface in the base 4, one end of the link 110 is hingedly coupled to the said bracket 109, and is located in the predetermined position of the said link 110. The protrusion 111 is coupled.

The cam 112 is coupled to the outer periphery of the shaft 104 to be in contact with the protrusion 111, and the operation unit 113 is in contact with the other end of the link 110, and is introduced into the upper portion of the operation unit 113. The operating rod 114 for operating the latch (not shown) is coupled.

A second spring 125 is installed at the outer circumferential edge of the operating rod 114 to return the operating rod 114 to its original position, and a washer 130 is installed at the lower outer circumferential edge of the operating portion 113. The first spring 124 is coupled to the top of the washer 130 so that the operation unit 113 can be returned to its original position.

That is, the flow of the first spring 124 is prevented by the washer 130 and the operation unit 113 returns to its original position by the first spring 124 in the state in which the cart 2 is pulled in and out. do.

The first trolley retracting and withdrawal prevention means has an operating shaft 115 hinged to the shaft 104 so as to be pivoted when the trolley 2 is retracted and withdrawn, and reciprocates up and down at the other end of the operating shaft 115. The third lever 120 to be moved is in contact, and the fourth lever 121 pivoted around the hinge is hinged to the third lever 120.

A coupling hole 116 is formed at the other side of the fourth lever 121 and inserted into the coupling hole 116 to the worm 102 to prevent the worm 102 of the worm gear 101 from rotating. The pin 117 is formed.

A first lever 118 is installed so that the second balance portion retracting and withdrawing means come out to the side of the balance portion 2 and is hinged to the other end of the first lever 118 to the pressing member 123. A sixth lever 129 is pivoted around the first hinge shaft 127 along the first lever 118 pushed by the sixth lever 129, and the sixth lever 129 is coupled with the first hinge shaft 127. A fifth lever 122 coupled to and pivoted along the sixth lever 129 is installed.

The fifth lever 122 has a second lever 119, which is reciprocated up and down, is hinged, and a third lever 120, which is in contact with the other end of the second lever 119, is reciprocated up and down, is installed. A fourth lever 121 pivoted around the hinge is hinged to the third lever 120.

A coupling hole 116 is formed at the other side of the fourth lever 121 and inserted into the coupling hole 116 to the worm 102 to prevent the worm 102 of the worm gear 101 from rotating. The pin 117 is formed.

The first lever 118 and the fifth lever 122 are hinged by the first hinge shaft 127 and the third lever 120 and the fourth lever 121 are the second hinge shaft 128. It is hinged by.

A plurality of washers 130 are formed at the outer circumferential edge of the third lever 120, and third springs 126 are provided between the washers 130, respectively.

That is, when the third spring 126 is prevented from flowing by each washer 130 and the second hinge shaft 128, and the cart 2 is blocked by the third spring 126, the third spring 126 is blocked. The lever 120 is returned to its original position by the third spring 126.

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

When drawing or drawing the trolley portion 2 of the vacuum circuit breaker, the worm 102 of the worm gear 101 installed in the base 4 coupled to the lower portion of the trolley portion 2 is rotated forward and backward in the drawing. Clockwise and counterclockwise).

That is, when the counterclockwise rotation of the worm 102 of the worm gear 101 is introduced in order to draw in the cart 2, the worm wheel 103 rotates toward the front side of the vacuum circuit breaker by the rotation of the worm 102. Therefore, the shaft 104 coupled to the worm wheel 103 and supported on both sides of the base 4 is rotated counterclockwise along the worm wheel 103 and respectively coupled to both ends of the rotated shaft 104. Each protrusion 106 of the lever 105 is guided along the long hole 108 of the guide 107 installed on both sides of the inner surface of the switchboard 10, and moved to the upper portion of the long hole 108, thereby introducing the trolley portion 2. The operation is completed.

Then, when pulling out the cart 2 to repair and inspect the vacuum circuit breaker, when the worm 102 is rotated in the forward rotation direction, the worm wheel 103 is rotated to the rear side of the vacuum circuit breaker and the shaft 104 is also clocked. Direction so that each projection 106 of the lever 105 is moved to the lower portion of the long hole 108 along the long hole 108 of the guide 107, so that the cart 2 is drawn out.

As described above, when the trolley portion 2 is retracted, a protrusion 111 formed at a predetermined position of the link 110 hinged to one end of the bracket 109 coupled to the upper surface of the base 4 is formed on the shaft 104. The link 110 is rotated by the rotating shaft 104 in contact with the outer circumferential edge of the cam 112 coupled to the outer circumferential edge of the cam 112, in which the protrusion 111 is positioned at the long shaft portion of the cam 112. Therefore, the other end of the link 110 is moved to the upper side of the vacuum circuit breaker, and the operation unit 113 in contact with the other end of the link 110 is also moved upward.

Therefore, the operation of the operation rod 114 coupled to the upper portion of the operation unit 113 is not made, so that the introduction of the balance unit 2 is prevented when the vacuum breaker is pulled in and pulled out.

Then, when the introduction or withdrawal of the cart 2 is completed, the protrusion 111 of the link 110 is located at the shortened portion of the cam 112, so that the upper part of the washer 130 formed at the outer periphery of the operation unit 113. The operation unit 113 is returned to its original position by the first spring 124 installed in the operation rod 114, so that the cart 2 is input.

Here, when the trolley portion 2 is inserted, a change lever (not shown) hinged in the trolley portion 2 is rotated to the lower side of the vacuum circuit breaker, which is coupled to the lower portion of the change lever and coupled to the shaft 104. One end of the operated operation shaft 115 is moved to the lower side of the vacuum circuit breaker by the change lever about the shaft 104, and the other end is moved to the upper side of the vacuum circuit breaker.

The third lever 120 in contact with the other end of the operation shaft 115 is moved upward by the other end of the operation shaft 115 moved upward, and the third lever 120 and the second hinge shaft 128 Since the fourth lever 121 hinged by the pivot pivot about the hinge, the other end of the fourth lever 121 is moved to the lower side of the vacuum circuit breaker.

Since the pin 117 formed at the other end of the worm 102 of the worm gear 101 is inserted into the coupling hole 116 formed at the other end of the fourth lever 121 moved downward, the worm 102 is rotated. Since the pin 117 is caught in the coupling hole 116, the cart 2 is prevented from being pulled in or pulled out.

When the cart 2 is blocked, the change lever is rotated upward of the vacuum breaker, so that one end of the operation shaft 115 coupled to the change lever is moved upward, and the other end is moved downward. The third lever 120 which has been in contact with the other end of the) is returned to its original position by the third spring 126.

That is, since the third springs 126 are respectively provided between the plurality of washers 130 formed at the outer circumferential edge of the third lever 120, the third springs 126 are respectively disposed by the washers 130 and the second hinge shafts 128. The third lever 120 is returned to its original position when the bogie 2 is blocked by the third spring 126 while the spring 126 is prevented from flowing.

As described above, when the third lever 120 returns to its original position, the fourth lever 121 coupled with the third lever 120 and the second hinge shaft 128 is rotated about the hinge shaft and the fourth lever is rotated. Since the pin 117 of the worm 102 is removed from the coupling hole 116 formed at the other end of the 121, the worm wheel 103 is rotated by the rotation of the worm 102. Withdrawal and withdrawal are possible.

In addition, when the first lever 118 protruding from the side of the balance unit 2 is pushed by the pressing member 123 to insert the ground switch 9, the sixth lever engaged with the other end of the first lever 118. The fifth lever 129 is rotated about the first hinge axis 127 while being pushed along the first lever 118 and coupled with the sixth lever 129 by the first hinge axis 127. 122 is also rotated about the first hinge shaft 127, the second lever 119 hinged to one side of the fifth lever 122 is moved to the upper side of the vacuum circuit breaker.

Since the third lever 120, which is in contact with the other end of the second lever 119 that is moved upward, is also moved upward along the second lever 119, the third lever 120 and the second hinge shaft 128. The fourth lever 121 hinged by the pivot is rotated about the hinge so that the other end of the fourth lever 121 is moved to the lower side of the vacuum circuit breaker.

Since the pin 117 formed at the other end of the worm 102 of the worm gear 101 is inserted into the coupling hole 116 formed at the other end of the fourth lever 121 moved downward, the worm 102 is rotated. Since 117 is engaged in the coupling hole 116, the pull-out portion 2 is prevented from being pulled out and pulled out when the ground switch 9 is inserted.

On the other hand, when the first lever 118 is pulled out of the cart 2 to stop the ground switch 9, the sixth lever 129 moves along the first lever 118 to the first hinge shaft 127. The fifth lever 122 hinged to the sixth lever 129 while being rotated about the second lever 129 is also rotated about the first hinge shaft 127, so that the second hinge hinged to the fifth lever 122. The lever 119 is moved downward of the vacuum circuit breaker by the fifth lever 122.

Along the second lever 119 moved downward, the third lever 120 is also moved downward by the elastic force of the third spring 126 provided on the outer circumference of the third lever 120 and returned to its original position. .

As described above, when the third lever 120 returns to its original position, the fourth lever 121 hinged to the third lever 120 is rotated so that the other end of the fourth lever 121 having the coupling hole 116 is vacuumed. Since the pin 117 of the worm 102 exits from the coupling hole 116 and rotates upward, the worm wheel 103 is rotatable by rotation of the worm 102. ) Allows entry and withdrawal.

As described above, the present invention prevents the introduction and release of the balance portion of the vacuum circuit breaker and prevents the introduction and discharge of the balance portion during the introduction of the balance portion, as well as the introduction and discharge of the balance portion during the introduction of the ground switch. As it can prevent, not only the stability of the vacuum circuit breaker is improved, but also ground fault and safety accident can be prevented in advance.

Claims (4)

A cradle, a trolley that is pulled in and out along the cradle, a main circuit unit coupled to the rear of the trolley, a base coupled to a lower portion of the trolley, and a switchboard installed at the outside to surround the components; And a vibration circuit breaker installed in the switchgear and configured of a ground switch configured to ground the residual current at the load side. A guide 107 having a shaft 104 fixed to the worm wheel 103 of the worm gear installed in the trolley portion and rotating according to the rotation of the worm 102, and fixed to the switchboard and having a vertical long hole 108; A lever 105 fixed to the shaft and allowing the bogie to move as the protrusion 106 is inserted into the long hole of the guide, and the cam 112 and the protrusion 111 rotated by the shaft are connected. A link 110 moving up and down according to the rotation of the cam, and an operation unit 113 and an operating rod 114 installed at an upper portion of the link and rising together with the link to prevent the introduction of the bogie part when the bogie part is pulled in and out. The hinge shaft is coupled to the operation shaft 115 that rotates in conjunction with the change lever that rotates when the balance unit is inserted, and the third lever 120 that interlocks with the operation shaft. Consisting of a fourth lever 121 which prevents movement Safety device of the vacuum circuit breaker, characterized in that. The method of claim 1, Safety device for a vacuum circuit breaker characterized in that a spring for returning the operation portion raised to the lower outer peripheral portion of the operation portion to the original position. The method of claim 1, A coupling hole 116 is formed at one side of the fourth lever, and a pin 117 is fixed to the worm 102 so that the rotation of the worm is constrained as the live pin is fitted into the coupling hole. Safety device. The method of claim 1, The second lever 119 is connected to the third lever, and the first lever 118 is connected to the second lever via the fifth lever 122 and the sixth lever 129 to insert the ground switch. 1 is a safety device of a vacuum circuit breaker, characterized in that the pin is inserted into the coupling hole 116 of the fourth lever to restrain the rotation of the worm.