JPH11265642A - Switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a switchgear maintenance-free without using oil or packing by energizing a plurality of pressure pieces provided within a case along the circumferential direction, and forming a taper part between the minor diameter part and major diameter part of a movable bar formed so that a braking force is added in the interruption of an opening and closing part. SOLUTION: A movable bar 56 is moved down in an interrupting state. Although no braking force works in an input state because a minor diameter part 56a is opposed to a buffer body 64 formed of a pressure piece and a spring, a tapered part 56c then extends the inner end part of the pressure piece, and when a major diameter part 56b is opposed to the buffer body 64, a frictional force works between the both to work a braking force. On the other hand, when a vacuum interrupter is inputted, the movable bar 56 is moved upward. A case 63 is moved up together with the movable bar 56 by a play δbetween the case 63 and a lid 61, and the braking force is not worked in the initial stage. Although the braking force is worked to some degree in the middle stage, the speed in the input is not reduced so much since the buffer body 63 is not extended by the taper part 56c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing device, which has an improved damper structure.

[0002]

2. Description of the Related Art As shown in FIG. 10, a switching device includes a three-phase vacuum interrupter 25 as an opening and closing unit and an operation unit for operating the vacuum interrupter 25.

When the motor 4 rotates, the pawl 6, one end of which is connected to the eccentric position of the rotating body 5, reciprocates, and the pawl wheel of the operating shaft 1 supported by the one-way clutch 11 so as to rotate only clockwise. 7 is intermittently rotated clockwise. At this time, the closing spring 3, one end of which is connected via the arm 19, is compressed and stored, and when the roller 8 passes through the dead point and engages with the closing hook 9 as shown in FIG. The corresponding limit switch 22 operates to stop the rotation of the motor 4.

When the input electromagnet 10 pushes the input hook 9,
Since the roller 8 is disengaged from the input hook 9, the input cam 2 rotates clockwise at a high speed and pushes the roller follower 14 downward. Then, the arm 24, which is integrally fixed to the rotating shaft 12 to which the arm 13 is fixed, rotates counterclockwise, and a metal fitting 36, a press-contact spring 28, and an insulating rod that are rotatably attached to the tip of the arm 24. The movable lead rod 27 rises via 32, and the movable electrode 27a of the movable lead rod 27 comes into contact with the fixed electrode 26a of the fixed lead rod 26 in the container 39 having a vacuum inside, whereby the vacuum interrupter 25 is loaded.

At the same time as the closing operation, the breaking spring 16 connected to the tip of the arm 29 is charged, the roller follower 15 at the tip of the arm 31 is lowered, the trip hook 17 is returned by the action of the return spring 37, and the stopper 38 is returned. The roller follower 15 tries to move up after hitting, so that the roller follower 15 is restrained by the trip hook 17 and keeps the inserted state.

When the tripping hook 17 is pressed and rotated by the tripping electromagnet 18, the roller follower 15 is disengaged from the tripping hook 17, and the arm 24 is rotated clockwise by the release of the blocking spring 16. The movable lead bar 27 descends, and the vacuum interrupter 25 is turned off. At this time, the impact is alleviated by the lever 33 pressing the damper 35, and the lever 33 subsequently contacts the stopper 34.

[0007] The damper 35 is provided as described above. The reason will be described below. Vacuum interrupter 2
The cut-off spring 16 and the press-contact spring 28 are provided to shut off the block 5. The breaking speed is determined by the specifications of the vacuum interrupter 25, but usually, the fixed electrode 26a and the movable electrode 2
The speed at the moment when the device 7a separates is increased. For this reason, the energy immediately before the completion of the interruption is very large, and even if the lever 33 collides with the stopper 34, the movable lead bar 27 is too low from the interruption completion position due to twisting or escape of each part. Airtightness is maintained between the container 39 and the movable lead rod 27 via a bellows-like bellows (not shown). If the movable lead rod 27 is lowered too much, the bellows may be damaged or the life thereof may be shortened. Therefore, a damper 35 is provided.

On the other hand, when the vacuum interrupter 25 is turned on, the shut-off spring 16 and the pressure contact spring 28 are energized. Since the spring constant is large and the mass (movable mass) related to the speed is lighter than the case where the mass is cut off, the throwing speed may increase. In such a case, a damper is provided also for throwing in to reduce impact. When air dampers are used as these dampers, oil dampers are generally used because they are too large and it is difficult to fine-tune the speed.

FIG. 11 shows the structure of the oil damper. In the figure, 4
1 is a cylinder, 42 is a rod, 43 is a scraper, 44
Is a packing, 45 is an O-ring, 46 is a piston, 47 is an orifice, 48 is a snap ring, and 49 is a spring. FIG.
As shown in FIG. 5A, a groove 50 and four holes 51 communicating with the groove 50 are formed in the piston 46, and a single hole 52 is formed in the orifice 47. Oil 53 and air are injected into the cylinder 41. The air was injected because the right and left spaces of the piston 46 were occupied by the rod 42 by the rod 42 moving to the right in FIG. 11, and the volume was reduced, but the oil was not compressed. This is because air that can absorb the volume decrease is required.

When the rod 42 in FIG. 11 is pushed rightward, the piston 46 moves rightward against the urging force of the spring 49, and oil 53 on the right side of the piston 46
0, it moves to the left side of the piston 46 through the hole 51.

[0011]

However, the oil damper is troublesome because the oil must be changed periodically, and the O-ring, packing and scraper also need to be replaced.

Further, the oil damper is generally used vertically in order to inject air, and since oil and air are sealed in the cylinder, when the piston operates, the rod moves and the inside moves. The volume is reduced and the air is compressed.
For this reason, when the oil damper is used in a horizontal position, the hole of the orifice may come to the position of the oil or the position of the air, and the performance of the oil damper fluctuates. Therefore, when the oil damper is used in a horizontal position, an air tank is separately provided above the oil damper, or a hole of the orifice is set at a lower portion, which complicates the structure.

Accordingly, an object of the present invention is to provide a switchgear which solves the above problem.

[0014]

According to a first aspect of the present invention, there is provided an opening / closing device having an opening / closing portion at a tip end of a lever fixed to an operation shaft rotatably supported. A movable spring is connected to the movable lead rod, and a shut-off spring for shutting off the open / closed section in the closed state, and a closing spring for charging the shut-off spring at the same time as closing the open / closed section are provided and fixed to the operation shaft. In the opening and closing device in which a damper is interlockedly connected to the tip of the lever, the damper is constituted by a movable bar having one end rotatably connected to the tip of the lever, and a housing into which the other end of the movable bar is inserted and removed. A case is provided inside the housing that is slidable by a fixed amount along the axis of the movable rod, and a plurality of pressure pieces are provided in the case along the circumferential direction, and the pressure pieces are directed toward the center of the housing. Biasing means for biasing On the other hand, a small-diameter portion and a large-diameter portion are formed at one end and the other end of the movable bar so that a braking force is applied to the movement of the movable bar when the opening / closing portion is shut off, and a taper portion is formed between the small-diameter portion and the large-diameter portion. The opening and closing device according to claim 2 is characterized in that a substantially cylindrical fitting is provided in place of the pressure piece and the urging means, and a slit is formed at one location on the circumference of the fitting. The structure of the opening and closing device according to claim 3 is characterized in that an urging means for urging the case in a moving direction of the movable rod when the opening and closing unit is shut off is provided. The configuration of the opening / closing device according to claim 4, wherein the movable rod has a small diameter portion, a large diameter portion provided on both sides of the small diameter portion, and a tapered portion provided between the small diameter portion and the large diameter portion. The opening / closing device according to claim 5, wherein the movable rod is provided with a spring receiver. Kicking one, a base provided on the housing, characterized in that the blocking spring is provided a compression spring between the spring receiver and the base.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a switchgear according to the present invention will be described. In this embodiment, since a part of the conventional switchgear is improved, the description of the same parts as the conventional one will be omitted, and only different parts will be described.

(A) First Embodiment First, a first embodiment will be described with reference to FIGS.
As shown in FIG. 1, a lever 33 fixed to the operation shaft 12 is provided.
One end of a movable bar 56 is connected to the end of the movable bar 56 via a pin 55, and the other end is inserted into the housing 57.

The housing 57 is formed by forming an insertion hole 58 at the center of the main body 62 and accommodating the shock absorber 59, and attaching the lid 61 to the main body 62 via a screw portion 60. The shock absorber 59 is provided movably along the axis by the play δ.

The shock absorber 59 comprises a substantially ring-shaped case 63 and a shock absorber main body 64. The structure of the shock absorber main body 64 will be described with reference to FIG. The shock absorber main body 64 includes a plurality of pressure pieces 65 and a spring 66 as an urging means. The spring 66 is provided between the inner end and the outer end of the adjacent pressure piece 65 so as to press each part in the radial direction. The circumferential length of the inner end of the pressure piece 65 is L, and when a movable rod having an inner diameter larger than φD is inserted, a frictional force is generated between the pressure piece 65 and the movable rod. A braking force acts on the rod.

On the other hand, a small diameter portion 56
a, a large diameter portion 56b is formed at the base end, and a tapered portion 56 is provided between the small diameter portion 56a and the large diameter portion 56b.
c is formed. This is such that a braking force is applied to the movable rod 56 when the vacuum interrupter 25 is cut off from the closed state to the closed state.

Next, the operation of the switching device will be described.
When the vacuum interrupter 25 is turned off, the movable rod 5
6 moves down. 3A, the braking force does not act because the small diameter portion 56a corresponds to the shock absorber main body 64 in the closed state, but thereafter the tapered portion 56c pushes the inner end of the pressure piece 65 to spread, and the large diameter. When the portion 56b corresponds to the shock absorber main body 64, a frictional force acts between the two and a braking force acts. For this reason, the speed of the movable lead bar 27 in the final stage of the shutoff operation shown in FIG.

On the other hand, when the vacuum interrupter 25 is loaded, the movable rod 56 moves upward. Since there is play δ between the case 63 and the lid 61, the case 63 moves upward together with the movable rod 56 as shown in FIG. 3 (c), and no braking force is initially applied. In the middle period, the brake is applied to some extent, but the closing speed is sufficient and the tapered portion 56c is
The speed at the time of introduction does not become so small because it does not spread out.

(B) Second Embodiment Next, a second embodiment is shown in FIG. In this embodiment,
A leaf spring 67 is provided as urging means provided between the pressure pieces 65 in the shock absorber main body 64. The leaf spring 67 is formed in a substantially U-shape. The other configuration and operation are the same as those of the first embodiment, and thus the description is omitted.

(C) Third Embodiment Next, a third embodiment is shown in FIG. In this embodiment,
A substantially cylindrical fitting 68 is provided in place of the pressure piece and the urging means. The metal fitting 68 includes a cylindrical portion 68a, a tapered portion 68b, and an outer peripheral portion 68c, and a slit 68d is formed at one position on the circumference. The slits 68e and 6e are equally spaced along the circumference of the tapered portion 68b and the outer peripheral portion 68c.
8f is formed. Other configurations and operations are the same as those of the first embodiment, and therefore, description thereof will be omitted.

(D) Fourth Embodiment Next, a fourth embodiment is shown in FIG. In this embodiment,
A cylindrical collar 69 having a small friction coefficient is provided between the main body 62 and the case 63, and a spring 70 is provided between the lid 61 and the case 63 as urging means.

This is to ensure that the shock absorber 59 returns after moving upward, and the collar 69 or the spring 7
Only one of 0 may be provided. Other configurations and operations are the same as those of the first embodiment, and therefore, description thereof will be omitted.

(E) Fifth Embodiment Next, a fifth embodiment is shown in FIG. In this embodiment,
A large diameter portion 56b is provided above and below the small diameter portion 56a, and a taper portion 56c is provided between the small diameter portion 56a and the large diameter portion 56b so that the braking force acts not only when the vacuum interrupter is shut off but also when the vacuum interrupter is turned on. It is a thing.

When the movable rod 56 moves down from the state of the vacuum interrupter shown in FIG. 7 (a), it passes through the non-braking state shown in FIG. 7 (b) and then enters the braking state shown in FIG. 7 (c). The interrupter is shut off.

Conversely, the movable rod 56 is moved from the cut-off state shown in FIG.
Moves upward, after passing through the non-braking state between FIGS. 7 (d) and 7 (e), the state becomes the braking state of FIG. 7 (a), and the vacuum interrupter enters the closed state. In other words, the braking force is applied both when the vacuum interrupter is turned on and off.

(F) Sixth Embodiment FIG. 8 shows a sixth embodiment. In this embodiment,
The lever 33 disposed on the right side of the operation shaft 12 in FIG.
Is arranged on the left side as shown in FIG. 8, so that the blocking spring 71 is a compression spring such that the compression spring which has been compressed and stored when being closed is released when shut off.

As shown in the figure, a housing 57 is attached to a fixing portion 73 via an L-shaped base 72, and a through hole 74 penetrating the housing 57 and the base 72 is formed. In this embodiment, the arrangement of the small-diameter portion 56a and the large-diameter portion 56b of the movable rod 56 is upside down from that in FIG.
Then, a spring receiver 75 is provided integrally with the movable rod 56,
The blocking spring 71 is provided between the spring receiver 75 and the base 72 so as to surround the housing 57.

In such an opening / closing device, a braking force is applied when the movable bar 56 is shut off when the shut-off spring 71 is released. Since the cut-off spring 71 and the damper are integrated, the occupied space can be reduced.
Act as a first guide.

(G) Seventh Embodiment Finally, a seventh embodiment is shown in FIG. In this embodiment,
In order to apply a braking force at both closing and closing, the movable rod 56 has a small-diameter portion 56a and two large-diameter portions 56b as shown in FIG.
Are formed.

Accordingly, a braking force is applied both at the time of closing and at the time of shutting off. The other configuration and operation are the same as those of the sixth embodiment, and thus the description is omitted.

[0034]

As can be seen from the above description, claim 1
According to the opening / closing device according to any one of (1) to (4), since the shock absorber for suppressing the movement of the movable rod is provided, it is maintenance-free without using oil and packing like an oil damper. In addition, since oil or packing whose characteristics change greatly at low and high temperatures is not used, the characteristics at low and high temperatures are constant, and a stable operation speed can be obtained.

According to the opening and closing device according to the fifth aspect, since the damper and the blocking spring are integrally formed, the entire opening and closing device can be downsized. Further, the housing of the damper can be used as a guide for the blocking spring.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a main part of a switchgear according to a first embodiment of the present invention.

FIG. 2 relates to a shock absorber main body according to a first embodiment of the switchgear according to the present invention, wherein (a) is a plan view and (b) is a partially cutaway front view.

FIG. 3 is an operation explanatory view of the first embodiment in the switchgear according to the present invention;

4 (a) is a plan view and FIG. 4 (b) is a partially cutaway front view of a shock absorber main body according to a second embodiment of the switchgear according to the present invention.

5 (a) is a plan view, FIG. 5 (b) is a partially cutaway front view, and FIG. 5 (c) is a bottom view of a shock absorber body according to a third embodiment of the switchgear according to the present invention.

FIG. 6 is a configuration diagram of a main part of a switchgear according to a fourth embodiment of the present invention.

FIG. 7 is an explanatory view showing the configuration and operation of a switchgear according to a fifth embodiment of the present invention.

FIG. 8 is a configuration diagram of a main part of a switchgear according to a sixth embodiment of the present invention.

FIG. 9 is a configuration diagram of a main part of a switchgear according to a seventh embodiment of the present invention.

FIG. 10 is a configuration diagram of a conventional switchgear.

FIG. 11 is a cross-sectional view of an oil damper in a conventional switching device.

FIG. 12 relates to an oil damper in a conventional opening / closing device,
(A) is a perspective view of a piston, (b) is a perspective view of an orifice.

[Explanation of symbols]

 Reference Signs List 3 closing spring 12 operating shaft 16, 71 blocking spring 24, 33 lever 25 vacuum interrupter 27 movable lead rod 35 oil damper 56 movable rod 56a small diameter section 56b large diameter section 56c taper section 57 ... Housing 59 ... Buffer 63 ... Case 64 ... Buffer body 65 ... Pressure piece 66 ... Spring 67 ... Leaf spring 68 ... Metal fitting 68d ... Slit 70 ... Spring 72 ... Base 75 ... Spring receiver

Claims (5)

[Claims] 1. A shut-off spring for interlocking and connecting a movable lead rod constituting an open / close unit to a tip of a lever fixed to a rotatably supported operation shaft, and for shutting off the open / close unit in a closed state. And a closing spring that stores a closed opening / closing portion and simultaneously stores a closing spring for energizing the closing spring, wherein the damper is connected to a tip of a lever fixed to the operation shaft in an interlocking manner. It consists of a movable rod with one end rotatably connected and a housing into which the other end of the movable rod is inserted and removed. A case is provided inside the housing that is slidable by a fixed amount along the axis of the movable rod. The case is provided with a plurality of pressure pieces provided in the circumferential direction and a biasing means for biasing the pressure pieces toward the center of the housing, while controlling movement of the movable rod when the opening / closing section is shut off. So that the power is added End side, a small diameter portion at the other end, to form a large diameter portion, the small diameter portion, switchgear being characterized in that a tapered portion between the large diameter portion. 2. The opening / closing device according to claim 1, wherein a substantially cylindrical fitting is provided in place of the pressure piece and the urging means, and a slit is formed at one position on the circumference of the fitting. 3. The opening / closing device according to claim 1, further comprising: urging means for urging the case in a moving direction of the movable rod when the opening / closing portion is shut off. 4. The movable rod according to claim 1, wherein said movable rod has a small diameter portion, a large diameter portion provided on both sides of said small diameter portion, and a tapered portion provided between said small diameter portion and said large diameter portion. Item 4. The switchgear according to item 1, 2 or 3. 5. A block spring provided on a movable rod, a base is provided on a housing, and a compression spring is provided between the spring receiver and the base to form a blocking spring.
3. The switchgear according to claim 1.