JP3271511B2 - Breaker closing spring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a mounting structure of a closing spring of a circuit breaker.

[0002]

2. Description of the Related Art In general, the faster a contact of a circuit breaker is opened and closed, the less the contact is damaged by an arc. Therefore, a so-called closing spring has been conventionally used to drive the contacts of the circuit breaker.

FIGS. 12 and 13 show an example of use of a conventional closing spring disclosed in Japanese Utility Model Laid-Open No. 2-5245.
Is a side view, and FIG. 13 is a top view. In the figure, reference numeral 5a denotes a shaft rotatably provided on an underframe (also referred to as a frame) 100 and driven by an electric motor (not shown).
This is a pulley fixed to a.

Reference numeral 6 denotes a cam fixed to the shaft 5a, and 6a denotes a crankpin provided on the cam 6 at a position distant from the shaft 5a. Reference numeral 4 denotes a closing spring device provided between the crank pin 6a and the underframe 100. The closing spring device 4 roughly includes a fixed-side spring receiver 12, a spring 7, and a movable-side spring receiver 11.

[0005] Reference numeral 11 denotes a movable spring receiver rotatably mounted on the crank pin 6a, 7 denotes a spring having one end fixed to the movable spring receiver 11, and 12 denotes a fixed spring fixed to the other end of the spring 7. It is receiving.

Reference numeral 1 denotes a pin for rotatably fixing the fixed-side spring receiver 12 to the underframe 100. The contacts (not shown) of the circuit breaker are opened and closed through a lever (not shown) driven by the cam 6. That is, when the shaft 5a is slowly rotated by an electric motor or the like (not shown), the cam 6 simultaneously rotates, and the crank pin 6a provided at an eccentric position is formed.
Starts to rotate around the axis 5a.

The distance between the pin 1 and the crank pin 6a decreases or increases with the rotation.
When the spring 7 is mounted in a compressed state, when the crank pin 6a approaches the pin 1, the spring 7 is further compressed and energy is stored, so that the rotation of the cam 6 is slowed down. Crank pin 6a is pin 1
When moving away from the cam, the stored energy is released, so that the rotation of the cam 6 is accelerated.

[0008] By utilizing the rotation of the cam 6 in this faster state, by opening the contacts of the circuit breaker,
The opening operation of the contact can be hastened. FIG. 14 is an explanatory view showing a configuration similar to the closing spring device 4 of FIGS. 12 and 13 in order to explain the problem in the above configuration in detail, which is shown in Japanese Utility Model Laid-Open No. 55-61932. Things.

In FIG. 14, reference numeral 11a denotes a movable spring support plate provided on the movable spring support 11, and reference numeral 12a denotes a fixed spring support plate provided on the fixed spring support 12. The spring 7 bends and bends easily when compressed. If the spring 7 bends or bends, a repulsive force of the spring 7 is generated in a lateral direction orthogonal to the axial direction of the spring 7, and there is a possibility that the expected force does not work on the crankpin 6a.

Therefore, the fixed-side spring receiver 12 has a tubular shape and extends inside the spring 7 to a position close to the movable-side spring receiving plate 11a, thereby preventing the spring 7 from bending or bending.

On the other hand, the movable side spring receiver 11 has a shaft 2
The shaft 2 extends inside the cylindrical fixed-side spring receiver to a position close to the fixed-side spring receiving plate 12a, and has a cylinder 3 provided at a tip end thereof. It slides freely inside the fixed side spring receiver 12.

Since the cylinder 3 has a certain length, the shaft 2 is always kept almost parallel to the axis of the cylindrical fixed-side spring support 12 regardless of the sliding position. I have. That is, no matter where the crank pin 6a moves, the spring 7 does not bend due to the movable bearing plate 11a and the fixed bearing plate 12a facing directly in front.

Since the structure of the closing spring device 4 is as described above, the weight is large. Further, the cylindrical fixed-side spring receiver 12 and the spring 7 rub against each other and are worn. By the way, although the crank pin 6a is started and stopped every rotation by the shaft 5a, it moves at a high speed of about 10 to 30 ms per revolution, so that a large weight causes another problem of inertia force.

Of course, in the conventional circuit breaker, as shown in, for example, Japanese Utility Model Application Laid-Open No. 61-96619, the rotational movement of the crank pin 6a is changed to a linear movement by using a link mechanism, and then one end is turned. There is also used a spring in which the linear movement is transmitted to the other end of a fixedly installed spring to eliminate the swing movement of the spring.

However, in such a configuration, a complicated link mechanism is required near the spring receiving plate, and a space for providing the link mechanism is required in an extra portion, so that there is a problem that the size becomes large.

[0016]

The conventional closing spring of the circuit breaker has the following problems since it is constructed as described above. 1) The structure of the closing spring is complicated and heavy.

2) With the position of the crankpin rotating at high speed, the position of the closing spring swings right and left, and due to its inertia force, a circumferential force of the rotational motion is further applied to the repulsive force of the spring when the crankpin rotates. .

3) A complicated link mechanism is required. 4) It becomes large. 5) The spring and the cylinder rub against each other and become worn.

According to the present invention, the structure of the closing spring is simple and light, and the closing spring does not swing around as the crankpin rotates. The structure is reduced in size without using a link mechanism. do not do. Which satisfies the condition of

[0020]

A closing spring device for a circuit breaker according to the present invention comprises: a crankpin driven by a cam shaft for opening and closing a contact; a rod having one end rotatably connected to the crankpin; A spring receiving plate fixed to the other end of the rod and having guided means, and a guide means for guiding the guided means in a direction parallel to both a surface including the shaft and a movement surface of the crankpin. It is.

Further, the guided means of the present invention is a guide hole provided in the spring receiving plate, and the guide means is parallel to both the surface including the shaft and the movement surface of the crankpin, and the guide hole is formed in the guide hole. A guide rod fixed to the frame so as to penetrate therethrough.

The guide rod according to the present invention is disposed inside the coil spring.

The guide bar of the present invention is composed of two steel bars arranged on both sides of the rod and fixed to the frame.

Further, the present invention has a spring receiving plate fixed to an intermediate position of the rod, and the other end of the rod is slidably inserted into a guide hole provided in the frame.

Further, the present invention has a spring receiving plate fixed to the other end of the rod, and the rod slidably passes through a guide hole provided in the frame at an intermediate position thereof.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. One embodiment of the present invention is shown in FIGS. In the drawing, the same or corresponding parts as those in the conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG.
1 is a perspective view of the closing spring device of the present invention, FIG. 2 is a side view (partial cross section) of FIG. 1, and FIG. 3 is a front view (partial cross section) of FIG.

In the figure, reference numeral 100 denotes an underframe (frame) of a circuit breaker (the whole is not shown). 5a is a shaft rotatably provided on the underframe 100 and driven by an electric motor (not shown), 6 is a cam fixed to the shaft 5a, 6a is a cam 6
This is a crankpin provided at a position distant from the upper shaft 5a. Reference numeral 4 denotes a closing spring device. The closing spring device 4 includes a rod 26, a spring receiving plate 28, a coil spring 7, and a guide rod 30.

Reference numeral 26 denotes a rod having one end rotatably connected to the crank pin 6a. The rod 26 penetrates the oblong hole 32 formed on the underframe 100 in a state where it does not contact the oval hole 32. Reference numeral 28 denotes a spring receiving plate fixed to the other end of the rod 26 by welding or nut fastening.

The spring receiving plate 28 is provided with two guide holes (referred to as guided means) 29. 7 is a spring receiving plate 2
8 is a coil spring inserted between the underframe 8 and the underframe 100 in a compressed state. Reference numeral 33 denotes a spring fixing tool for fixing the coil spring 7 to the underframe 100 so as not to shift.

Reference numeral 30 denotes a guide rod (guide means) fixed to the underframe 100 by welding or nut fastening, so as to be in the plane including the shaft 5a and parallel to the plane on which the crankpin moves. It is provided in. Guide rod 30
Also slidably penetrates the guide hole 29 of the spring receiving plate 28.

Next, the operation will be described. Spring receiving plate 2
8 slides on the guide rod 30 and can move up and down toward FIGS.

Then, the shaft 5a rotates and the crank pin 6a
Is changed, the spring receiving plate 28 is fixed to the end of the rod 26 at a right angle, so that the spring receiving plate 28 is tilted left or right depending on the inclination of the rod 26, or the size of the guide hole 29 is changed to the size of the guide rod 30.
When the cam 6 rotates and the position of the crank pin 6a rotates about the shaft 5a and the rod 26 tilts, the spring receiving plate 28 also tilts naturally as shown in FIG. be able to.

When the crank pin 6a comes to the lowermost position in FIG. 3 (tentatively called bottom dead center), the length of the coil spring 7 is the longest. Even in this case, the coil spring 7 is compressed. In this state, the coil spring 7 does not float off the spring receiving plate 28.

The crank pin 6a is shown in FIG.
When it comes to a position close to the left or right side of the
The slope of 8 is maximum. Therefore, at this time, as shown in FIG. 3, the coil spring 7 is not uniformly compressed, and the compression degree on the left side differs from that on the right side in FIG.

Then, three forces are applied to the spring receiving plate 28: a vertical spring force, a horizontal force, and a rotational moment acting in a direction to return the inclination of the spring receiving plate 28 as viewed in FIG. become.

The guide rod 30 has a strong structure against the force of the coil spring 7 in the left-right direction and has sufficient strength to hold the left and right positions of the spring receiving plate 28. Is applied to the guide rod 30 and the coil spring 7
Do not join.

Since the length of the rod 26 is longer than the diameter of the spring receiving plate 28, the rotational moment applied to the spring receiving plate 28 is reduced to a small value when transmitted to the crankpin 6a.

FIG. 4 shows the compression force of the coil spring 7 and
The force applied to the crank pin 6a by the moment received by the spring receiving plate 28, and the direction and magnitude of the force applied to the crank pin 6a by combining the two forces are shown in accordance with the position of the crank pin 6a. It is. FIG.
4A shows the compression force of the coil spring 7, FIG. 4B shows the force applied to the crank pin 6a from the moment, and FIG.
Indicates the combined force of (a) and (b).

It is clear from the figure that the direction of the force is reversed at the top and bottom dead centers, and that the reaction force due to the moment has no adverse effect. Also, as the crank pin 6a moves,
Since the rod 26 swings right and left, an inertia force naturally acts. However, the mass of the moving part is smaller than that in the conventional case (that is, the rod 26, the spring receiving plate 28, and the coil spring 7).
About half of ) Small movement. That is, the spring receiving plate 28 and the spring 7 do not swing right and left. Therefore, the influence of inertia is reduced to a very small level.

Since the spring receiving plate 28 only moves along the guide rod 30 and does not escape in the lateral direction, a cylinder (shown at 12 in FIG. 14) for regulating the bending of the coil spring 7 and the like is necessary. And the friction of the coil spring 7 can be eliminated.

The guide rod 30 is positioned before and after the rod 26 (shaft 5a).
(In the axial direction), the inclination movement of the spring receiving plate 28 is made smoother. Although two guide rods 30 are shown in the figure, almost the same operation is possible with one guide rod.

Although the guide rod 30 is shown provided inside the coil spring 7, it may be provided outside. In this case, the outer diameter of the spring receiving plate 28 is
A guide hole 29 may be provided in the outer peripheral portion so as to be larger than the outer diameter of the coil spring 7.

Although the guide rod is shown as a round rod, it may be a prism.

Embodiment 2 5 and 6 show a second embodiment.
1 shows a closing spring device according to the present invention. FIG. 5 is a side view, and 48 is a spring receiving plate fixed to the end of the rod 26. FIG. 6 shows FIG.
The details of the spring receiving plate 48 are shown, and 37 is a notch (guided means). The notch 37 is provided outside the outer diameter of the coil spring 7, and the guide rod 30 fits into the notch 37.

In the drawing, the guide rod 30 is shown on the side of the spring receiving plate 48 where the coil spring 7 is not provided. However, the guide rod 30 may be provided on the side where the coil is provided as in FIG. FIG.
In this case, the guided means is not a hole as shown in FIG.

Embodiment 3 FIG. 7 shows a front view of the closing spring device according to the third embodiment. In the figure, reference numeral 38 denotes a spring receiving plate 2.
8 is a cylindrical guide covering the outside of the guide 8. In FIG. 7, the outer diameter of the spring receiving plate 28 is made slightly larger than the outer diameter of the coil spring 7, and the inner diameter of the cylindrical guide 38 is made larger than the outer diameter of the spring receiving plate 28. The spring 7 slides inside the cylindrical guide 38,
There is no fear that it will be scratched.

That is, the cylindrical guide 38 is for preventing lateral movement of the spring receiving plate 28, and is not for correcting distortion of the coil spring.

According to the method shown in FIG. 7, a durable guide means can be obtained for a simple and lightweight structure. of course,
Since the cylindrical guide 38 does not move with the movement of the rod 26, it is not necessary to consider the inertial force.

Embodiment 4 FIG. 8 is a side view and FIG. 9 is a front view of the closing spring device according to the fourth embodiment. FIG.
In FIG. 9, the rod 26 is inserted into the guide hole 35 provided in the underframe 100.
The guide means is constituted by extending the front end of the guide so as to be slidable.

This method is excellent in that the guide bar 30 shown in FIGS. 1 to 3 is not required. There is a problem that the spring receiving plate 28 swings slightly and that the underframe 100 must be provided below the spring receiving plate 28.

Embodiment 5 FIG. FIG. 10 shows a side view and FIG. 11 shows a front view of a closing spring device according to the fifth embodiment. FIG.
In FIGS. 0 and 11, the spring receiving plate 36 for fixing the coil spring 7 to the underframe 100 is used. However, this spring receiving plate 36 is extended to near the spring receiving plate 28, and the rod 26 is penetrated to the tip. Guide hole 35 is provided.

The size of the guide hole 35 is slightly larger than the thickness of the rod 26, and the rod can slide freely.

[0053]

The closing spring device of the present invention has a simple structure and a light weight.

Further, the mass of the movable part is small and the inertial force is small.

Further, no complicated link mechanism is used.

The shape is small.

Further, since there is no need for a cylinder for preventing the spring from rolling, there is an effect that the spring is not worn.

[Brief description of the drawings]

FIG. 1 is a perspective view of a closing spring device according to a first embodiment.

FIG. 2 is a side view of the closing spring device of FIG.

FIG. 3 is a front view of the closing spring device of FIG. 1;

FIG. 4 is a view for explaining the operation of the closing spring device of FIG. 1;

FIG. 5 is a side view of a closing spring device according to a second embodiment.

FIG. 6 is a detailed external view of a spring receiving plate of the closing spring device of FIG. 5;

FIG. 7 is a front view of a closing spring device according to a third embodiment.

FIG. 8 is a side view of a closing spring device according to a fourth embodiment.

FIG. 9 is a front view of the closing spring device of FIG. 8;

FIG. 10 is a side view of a closing spring device according to a fifth embodiment.

FIG. 11 is a front view of the closing spring device of FIG. 10;

FIG. 12 is a front view of a conventional closing spring device.

FIG. 13 is a top view of the closing spring device of FIG.

14 is a sectional view of a closing spring of the closing spring device of FIG.

[Explanation of symbols]

 Reference Signs List 4 closing spring device 5a shaft 6 cam 6a crank pin 7 coil spring 26 rod 28 spring receiving plate 29:35 guide hole 30 guide rod 37 notch portion 48 spring receiving plate with notch portion 38 pipe-shaped guide 36 spring receiving base 100 Underframe (frame)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-157417 (JP, A) JP-A-58-184228 (JP, A) JP-A 4-18941 (JP, U) JP-A 62-184 4042 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 33/28-33/59

Claims (6)

(57) [Claims] 1. A frame, a shaft rotatably supported by the frame, a cam fixed to the shaft and rotating with the shaft, a contact opened / closed by the cam, and a charge stored by the rotation of the shaft. A closing spring device for a circuit breaker provided with a spring, comprising: a crank pin driven by the shaft; a rod having one end rotatably connected to the crank pin; and a guided means fixed to the other end of the rod. And a coil having one end fixed to the spring receiving plate and coiled with a predetermined space around the rod on the side closer to the crankpin than the spring receiving plate, and the other end fixed to the frame. And a guide means fixed to the frame and guiding the guided means in a direction parallel to both a surface including the shaft and a movement surface of the crankpin. A closing spring device for a circuit breaker, characterized in that: 2. The guided means is a guide hole provided in a spring receiving plate, and the guide means is parallel to a surface including the shaft and a movement surface of the crank pin on the frame, and slides in the guide hole. 2. The closing spring device for a circuit breaker according to claim 1, wherein said guide bar is fixed so as to penetrate as much as possible. 3. The closing spring device for a circuit breaker according to claim 2, wherein the guide bar is disposed inside the coil spring. 4. A guide rod is provided on both sides of the rod.
3. The closing spring device for a circuit breaker according to claim 2, wherein the closing spring device is made of a steel bar. 5. A frame, a shaft rotatably supported by the frame, a cam fixed to the shaft and rotating with the shaft, a contact opened / closed by the cam, and a charge stored by the rotation of the shaft. A closing spring device for a circuit breaker provided with a spring, comprising: a crankpin provided at a position away from the shaft in parallel with the shaft; a rod having one end rotatably connected to the crankpin; A spring receiving plate fixed at an intermediate position, one end fixed to the spring receiving plate, coiled with a predetermined space around the rod nearer to the crankpin than the spring receiving plate, and the other end fixed to the frame body; And a closing spring made of a coil spring,
The other end of the rod is slidably inserted into a guide hole provided in the frame body, wherein the closing spring device of the circuit breaker is provided. 6. A frame, a shaft rotatably supported by the frame, a cam fixed to the shaft and rotating with the shaft, a contact opened / closed by the cam, and a charge stored by the rotation of the shaft. A closing spring device for a circuit breaker provided with a spring, comprising: a crankpin provided at a position away from the shaft in parallel with the shaft; a rod having one end rotatably connected to the crankpin; A spring receiving plate fixed to the other end, and one end fixed to the spring receiving plate, coiled with a predetermined space around the rod closer to the crankpin than the spring receiving plate, and the other end fixed to the frame body; And a closing spring formed of a coil spring, wherein the rod slidably penetrates a guide hole provided in the frame at an intermediate position thereof.