JPH0613035U - Vacuum circuit breaker for arc prevention - Google Patents

Abstract

(57) [Summary] [Object] To provide a vacuum circuit breaker for arc prevention in which the volume of the vacuum circuit breaker is reduced, the occurrence of an arc is prevented, and the wear state of each contact can be visually inspected. An oscillating lever is formed with a switchgear housing 22 having a vacuum valve 23 on a side of an operating unit 21 and is engaged with a cam 27 of the operating unit 21 and a movable contact 23b of the vacuum valve 23, respectively. 29 is pivotally supported on the lower side of the operating unit 21 and the opening / closing device housing 22, and the swing lever 29 is swung up and down by the rotation of the cam 27.
3b is brought into contact with or separated from the fixed contacts 23a in the vacuum valve 23, and these contacts are opened and closed. A collar scale 29c is provided at the lower end of the rocking lever 29 so that wear can be confirmed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vacuum circuit breaker, more specifically, a vacuum circuit breaker for arc protection, which reduces the volume of the vacuum circuit breaker, prevents arcing, and visually inspects the amount of wear of contacts. It is about machines.

[0002]

[Prior art]

 Generally, when the high voltage line is opened and closed in the air, an arc is generated from the contact point. Therefore, the high voltage line is opened and closed in a vacuum using a vacuum circuit breaker to prevent the arc from being generated. In such a conventional vacuum circuit breaker, as shown in FIGS. 4 and 5, the operating unit 3 for opening and closing the fixed contact 2a and the movable contact 2b in the vacuum valve is provided on one side of the vacuum circuit breaker. A drive motor, a power transmission mechanism, and a cam 4 engaged with the power transmission mechanism are housed inside the operating unit 3. In addition, a first link bar 5 swinging up and down by the rotation of the cam 4 is pivotally supported on the inner side wall of the operation device section 3, and a base end of the first link bar 5 is pivotally supported. A second link bar 6 is formed so as to be swingable on the upper and lower sides. Further, one end of the intermediate portion of the first lever 8 is engaged with the front end of the second link bar 6, and the other end of the intermediate portion of the first lever 8 is swingable by a rotating pin 7 so that the vacuum circuit breaker can swing. The first lever 8 is pivotally supported at a predetermined portion, and the base end of the first lever 8 is elastically supported on the upper surface of the operation unit 3 via a compression spring 9. The base end of the rod 11 is attached to the other end of the first lever 8. It is screwed by the nut 10. A spring 12 is inserted into the outer peripheral wall surface of the rod 11, a long hole 11a is formed in the upper end of the rod 11, and a base end of a second lever 14 is formed in the long hole 11a. An elongated hole 14a formed at the base end of the second lever 14 and a pin 13 are swingably engaged with each other, and an intermediate portion of the second lever 14 is pivotally supported by a swing pin 15 at a predetermined portion of a vacuum circuit breaker. The base end of the movable contact shaft is pivotally supported by the swing pin 16 on the other end of the second lever 14, and the movable contact 2b is adhered to the front end of the movable contact shaft. The fixed contact 2a is housed inside the vacuum valve 2, and high-voltage lines 1b and 1a are connected to the movable contact shaft and the fixed contact shaft, respectively.

The operation of the conventional vacuum circuit breaker configured as described above will be described below. The vacuum circuit breaker is used to open and close the high voltage lines 1a and 1b. When repairing the high voltage line, the vacuum circuit breaker can be manually operated to open the high voltage line, or a controller can be used. It is designed to detect overcurrent and automatically open the high voltage line. The high voltage lines 1a and 1b are opened and closed by bringing the movable contact 2b of the vacuum valve 2 into contact with or separated from the fixed contact 2a. First, the case of connecting the high voltage lines 1a and 1b will be described. The cam 4 is rotated by the driving force mechanism in the operation unit 3, the protruding portion of the cam 4 swings the first link bar 5 upward, and the second link bar 6 moves upward. Is pushed up, the first lever 8 is swung upward around the pivot pin 7, and the base end of the first lever 8 compresses the compression spring 9 downward. Then, the rod 11 is pushed up by the upward swing of the other side end of the first lever 8, the base end of the second lever 14 swings upward, and the other side end of the second lever 14 moves. It swings downward. Therefore, the shaft of the movable contact is moved downward and the movable contact 2b is brought into contact with the fixed contact 2a on the inner side of the vacuum valve 2. In this case, when the base end of the second lever 14 is swung upward, the pin 13 is inserted into the rod 11 until the pin 13 is positioned at the upper end portion of the elongated hole 11a. The spring 12 is compressed, and the restoring force of the spring 12 pushes the base end of the second lever 14 upward upward, so that the movable contact 2b is continuously brought into close contact with the fixed contact 2a.

On the other hand, when the high voltage lines 1a and 1b are opened automatically or manually by the user by detecting the overcurrent, the cam 4 is rotated by the driving force mechanism in the operation unit 3, The lower portion of the cam 4 engages with the first link bar 5, the first link bar 5 is swung downward, the second link bar 6 is lowered downward, and the first lever 8 is moved. The other end of the first lever 8 is swung downward by the restoring force of the compression spring 9 that is swung downward and is engaged with the base end of the first lever 8. Then, the rod 11 descends and the base end of the second lever 14 swings downward, and the other end of the second lever 14 swings upward to move the vacuum valve 2 inside. The contact 2b is lifted, separated from the fixed contact 2a, and opened.

[0005]

[Problems to be solved by the device]

 However, in the conventional vacuum circuit breaker configured as described above, normally, the contact portion of the vacuum valve should be set at a predetermined height from the ground for insulation, but the movable contact is located above the vacuum valve. Since the second lever that opens and closes is installed, there is a disadvantage that the height of the vacuum circuit breaker becomes high. Moreover, it is extremely complicated because a large number of parts that open and close the movable contact and the fixed contact are complicatedly configured, and the complicated opening and closing operation of the contact cannot be performed due to the complicated mechanism. There was a disadvantage that arcs were likely to occur. Further, when the contact wears, an arc is generated due to poor contact, but the wear state of the contact cannot be easily confirmed, so that there is an inconvenience that it is not possible to properly grasp the replacement point of the contact. .

As a result, the inventors of the present invention have conducted extensive research in order to solve such problems, and as a result, intend to provide the following arc-breaking vacuum circuit breaker.

An object of the present invention is to simply configure a contact opening / closing mechanism for opening and closing a movable contact on a fixed contact, perform the opening / closing operation accurately, prevent arc generation, and improve product reliability. The present invention intends to provide a vacuum circuit breaker for arc prevention.

Another object of the present invention is to provide an arc preventing vacuum circuit breaker in which the volume of the vacuum circuit breaker is reduced and the handling is simplified.

Further, another object of the present invention is to visually confirm the wear state of each contact point easily, accurately grasp the replacement point of each contact point, and perform the contact replacement appropriately. It is intended to provide a vacuum circuit breaker for arc prevention.

[0010]

[Means for Solving the Problems]

 The object of the present invention is to provide an electric power source on the inner side of the power drive source, a power transmission mechanism, a cam engaged with the power transmission mechanism, and an external high voltage line. And a vacuum valve accommodating a fixed contact and a movable contact, which are electrically connected to each other,

The operation unit is formed on one side of a vacuum circuit breaker, a switchgear housing is formed on a side of the operation unit, and the vacuum valve is installed on an inner upper side of the switchgear housing.

A fixed shaft is fixed to a predetermined portion of the vacuum circuit breaker, and a swing lever is fitted to the fixed shaft so as to swing up and down,

A base end portion of the rocking lever is engaged with the outer peripheral surface of the cam, and the other end of the rocking lever is rocked up and down around the fixed shaft, and the other end of the rocking lever is This is achieved by configuring the arc preventing vacuum circuit breaker so that the movable contact is brought into contact with or separated from the fixed contact by the swinging of the side end, and the contacts are opened and closed.

[0014]

[Action]

 The power transmission mechanism is moved by the power drive source on the inner side of the operation unit of the vacuum circuit breaker, the cam rotates, and the rocking lever engaged with the cam rocks in the vertical direction. The movable contact is vertically moved up and down by the swing of the other end portion of the swing lever, and the movable contact is brought into contact with or separated from the fixed contact to open and close the contacts.

[0015]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the vacuum circuit breaker for preventing arc according to the present invention, as shown in FIGS. 1, 2 and 3, an operating unit 21 is formed on one side of the vacuum circuit breaker, and an operating unit 21 is formed on the inner side of the operating unit. A power drive source, an operation transmission mechanism, and a cam 27 engaged with the power transmission mechanism are housed. Further, a switchgear housing 22 is screwed onto the outer side wall of the operating device section 21, and a vacuum valve 23 accommodating a fixed contact 23a and a movable contact 23b is fixed to the upper inside of the switchgear housing 22. There is. An upper conductive piece 24a is connected to the fixed contact 23a via a fixed contact shaft, the upper conductive piece 24a is screwed onto the upper side of the switchgear housing 22, and one end of the high voltage line is connected to the upper end of the upper conductive piece 24a. The sides are connected by a connector 26a. One end of the insulating rod 33 is connected to the movable contact 23b via a movable contact shaft, and a base end of a conductive piece 24b is screwed to an inner side of the opening / closing housing 22 at an intermediate portion of the insulating rod 33. The base end of the conductive piece 24b is clamped by the clamp 25 to the lower end of the movable contact shaft via the flexible conductive wire 24c, and the end of the high voltage wire is connected to the front end of the conductive piece 24b. It is connected by 26b.

In addition, a hollow cylindrical spring cover 34 is formed downward at the base end of the insulating rod 33, and the outer peripheral wall surface of the spring cover 34 is provided for better insulation from the movable contact shaft. A plurality of protrusions 34a are respectively provided to project, and an insulating rod shaft 33a is provided to project downward on the inner side of the spring cover 34 and below the base end of the insulating rod 33. An elastic spring 35 is inserted inside the spring cover 34, and the spring 35 is hooked to a swing lever 29 described later via a washer 36.

Further, a fixed shaft 28 is fixed to a predetermined portion on the lower side of the vacuum circuit breaker, and a swing lever 29 is fitted on the fixed shaft 28 so as to swing up and down. A bearing holder 30 bearing a bearing 31 is fixed to the upper surface of the base end of the, and the cam 27 which rotates about a fixed shaft 27a is engaged with the bearing 31. A spring retaining hole 29a is formed in a side portion of the bearing holder 30 at a base end position of the swing lever 29, and one end of the tension spring 32 is engaged with the spring retaining hole 29a. The base end of the tension spring 32 is hooked on a predetermined portion on the lower side of the operating unit 21 so that the swing lever 29 is biased and supported. Here, a normal elastic body is used as the tension spring 32 that biases and supports the swing lever 29, and, for example, a compression spring that is compressed by the swing lever 29 may be used.

A through hole 29b is formed at the other end of the swing lever 29, and the insulating rod shaft 33a is penetrated through the through hole 29b so that the insulating rod shaft 33a is located at the lower side of the swing lever 29. The nut 37 is screwed to the. Further, a collar graduation portion 29c is formed on the outer peripheral surface portion of the insulating rod shaft 33a above the nut 37, and the spring 35 presses the worn state of the fixed contact 23a and the movable contact 23b by the graduation portion 29c. When contracted, the user can confirm it.

The operation of the arc preventing vacuum circuit breaker according to the present invention having the above-described structure will be described below. First, when the contacts 23a and 23b in the vacuum valve 23 are brought into contact with each other so as to be turned on, the cam 27 is rotated by the power drive mechanism on the inner side of the operation unit 21, and the protruding portion of the cam is changed. When the bearing 31 of the swing lever 29 is swung downward, the other end of the swing lever 29 is swung upward around the fixed shaft 28, and the spring 35 is compressed upward. Next, the insulating rod 33 is pushed upward, the movable contact 23b is brought into contact with the fixed contact 23a, and the contacts 23a and 23b are turned on. After that, since the movable contact 23b continuously compresses the fixed contact 23a by the restoring force of the compressed spring 35, the contacts 23a and 23b continuously maintain the close contact state, and the arc is not generated. To be prevented.

Further, when the above occurs in the high voltage line, a control command is automatically applied to the operating unit 21 by the detection of a controller (not shown), and the cam 27 is driven by the drive of the power source and the transmission mechanism. Is rotated, the lower portion of the cam 27 is engaged with the bearing 31 of the rocking lever 29, and the rocking lever 29 is pulled by the tension spring 32, and the other end of the rocking lever 29 is centered on the fixed shaft 28. Is swung downwards. Next, the insulating rod 33 is lowered to lower the movable contact 23b, the movable contact 23b is separated from the fixed contact 23a, and the contacts 23a and 23b are turned off. When the contacts 23a, 23b are brought into contact with each other in the ON operation, the other end of the rocking lever 29 pushes up the spring 35, and the nut 37 has a color scale on the outer peripheral surface of the upper insulating rod shaft 33a. Since the portion 29c is exposed, the user can check the exposed color scale portion 29c, easily grasp the wear state of the contact surfaces of the contacts 23a and 23b, and replace the contacts 23a and 23b with each other. Will be able to judge accurately.

[0021]

[Effect of device]

 As described above, in the arc protection vacuum circuit breaker according to the present invention, the mechanism for opening and closing each contact is installed below the vacuum valve, and the connecting rod with the movable contact is formed by the insulating rod. The effect is that the height of the vacuum circuit breaker can be made lower than before and the insulation condition can be maintained in good condition. Moreover, since the mechanism for opening and closing each contact is formed extremely easily, there is an effect that the opening and closing operation of the contact can be performed accurately. Further, since the color scale is formed on the predetermined portion of the insulating rod, there is an effect that it is possible to easily confirm the wear state of each contact and to accurately grasp the replacement point of these contacts.

[Brief description of drawings]

FIG. 1 is a side view showing the structure of a vacuum circuit breaker for arc prevention according to the present invention.

FIG. 2 is an enlarged view of “A” part of FIG. 1 at both end portions of the swing lever according to the present invention.

FIG. 3 is also an enlarged view of a “B” portion in FIG. 1.

FIG. 4 is a schematic side view of a conventional vacuum circuit breaker.

FIG. 5 is a schematic operation diagram of a conventional vacuum circuit breaker.

[Explanation of symbols]

 21 Control Unit 22 Housing 23 Vacuum Valve 23a Fixed Contact 23b Movable Contact 24a Conductive Piece 24b Conductive Piece 24c Conductive Wire 25 Clamp 26a, 26b Connector 27 Cam 27a Cam Shaft 28 Fixed Shaft 29 Swing Lever 29a Locking Hole 29b Through Hole 29c Color scale part 30 Holder 31 Bearing 32 Tension spring 33 Insulating rod 33a Insulating rod shaft 34 Spring cover 34a Projection 35 Spring 36 Washer 37 Nut

Claims (8)

[Scope of utility model registration request] 1. An operating unit (21) in which a power drive source, a power transmission mechanism, and a cam (27) engaged with the power transmission mechanism are housed inward, and an external high-voltage line is electrically powered, respectively. Fixed contact (23a) and movable contact (23b) that are electrically connected
A vacuum circuit breaker comprising: a vacuum valve (23) accommodating therein, wherein the operating unit (21) is formed on one side of the vacuum circuit breaker, and is opened and closed laterally of the operating unit (21). Device housing (2
2) is formed, the vacuum valve (23) is installed inside the switchgear housing (22), and a fixed shaft (28) is fixed to a predetermined portion of the vacuum circuit breaker. The rocking lever (29) is fitted in the rocking lever so as to swing vertically, and the base end portion of the rocking lever (29) is engaged with the cam (27), and the other side of the rocking lever (29). The end is rocked up and down around the fixed shaft (28), and the movable contact (23b) is rocked by the other end of the rocking lever (29).
An arc preventing vacuum circuit breaker configured to contact or separate the fixed contact (23a) to open and close the contacts (23a) and (23b). 2. The swing lever (29) has a bearing holder (30) supported by a bearing (31) fixed to the upper surface of the base end of the swing lever, and the cam () on the bearing (31). 27) are engaged and the cam (2
The swing lever (29) is fixed to the fixed shaft (28) by the rotation of 7).
The vacuum circuit breaker for arc prevention according to claim 1, wherein the vacuum circuit breaker swings up and down around the center. 3. The rocking lever (29) is formed with a hooking hole (29a) at a predetermined position on the side of the bearing holder (31) at the base end of the rocking lever (29). One end of the tension spring (32) is hooked on the (29a), and the base end of the tension spring (32) is hooked on a predetermined portion on the lower side of the operating unit (21) to swing the rocking lever (2).
9. The vacuum circuit breaker for arc prevention according to claim 1, wherein 9) is biased and supported. 4. The swing lever (29) is formed with a through hole (29b) at the other end of the swing lever (29), and an insulating rod (33) is insulated in the through hole (29b). Stick axis (3
The arc-preventing vacuum according to claim 1, wherein 3a) is provided through an elastic spring (35), and an upper end of the insulating rod (33) is connected to the movable contact via a movable contact shaft. Circuit breaker. 5. The insulating rod (33) is the insulating rod (3).
A hollow cylindrical spring cover (34) is formed downward at the base end of 3), and the insulating rod shaft (33) is formed on the inner side of the spring cover (34) at the lower end of the insulating rod (33).
a) is provided so as to protrude downward, the spring (35) is inserted inside the spring bar (34) on the outer peripheral side of the insulating rod shaft (33a), and the insulating rod shaft (33a) is connected to the through hole (33a). The arc interrupting vacuum circuit breaker according to claim 1, further comprising a nut (37) screwed on a bottom surface of the other end of the swing lever (29) penetrating the hole 29b). 6. A vacuum circuit breaker for arc prevention as claimed in claim 4, wherein the elastic spring (35) is a compression coil spring. 7. The spring cover (34) has a plurality of protrusions (34a) projectingly provided on an outer peripheral wall surface of the spring cover (34), thereby ensuring good insulation from the axis of the movable contact (23b). The vacuum circuit breaker for arc prevention according to claim 5, which is conspired. 8. The insulating rod shaft (33a) is provided on an outer peripheral surface of the insulating rod shaft (33a) above the nut (37).
A color scale portion (29c) is formed, and the fixed contact (23a) and the movable contact (23) are confirmed by checking the color scale portion.
6. The vacuum circuit breaker for arc prevention according to claim 1, wherein the wear state of b) can be grasped.