JPS6325634Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a device for preventing rotation of a movable shaft in a chopper or breaker, particularly a vacuum cutter or breaker.

Prior Art and Its Problems Figure 1 is a vertical cross-sectional view of a VI (vacuum interrupter) 1 of a general vacuum interrupter. A fixed shaft 3 equipped with a fixed contact 2 and a movable shaft (movable lead) 5 equipped with a movable contact 4 at its inner end that can freely come into contact with and separate from the fixed contact 2 are inserted. The movable shaft 5 is supported by an end plate 7 via a bearing 6 made of an insulator. The fitting portion of the movable shaft 5 with the bearing 6 is formed in a spline shaft portion or key groove 8, and the inner peripheral surface of the bearing 6 is also formed in a spline groove or key groove 9 to fit with the spline shaft portion 8. It is formed in Note that the member indicated by 10 is a bellows.

The movable shaft 5 is configured to be freely movable in the axial direction with respect to the bearing 6 via the spline shaft portion 8. Conventionally, the rotation prevention mechanism of the movable shaft 5 is as shown in FIGS. 2 and 3, for example. It was structured as shown in .
The structure of the conventional rotation prevention mechanism for the movable shaft 5 and its problems will be described below with reference to FIGS. 2 and 3.

FIG. 2 shows an example of a rotation prevention mechanism for the movable shaft 5, in which an axial hole 11 is bored in the flange portion 6a of the bearing 6, and the flange portion 12 is inserted into the hole 11.
The movable shaft 5 is configured to be prevented from rotating by fitting the fixing fitting 12 having a diameter of 1.a and welding the outer circumferential portion of the flange portion 12a to the end plate 7.

However, in this configuration, the fixture 12 and the end plate 7 are welded together after the bearing 6 and the end plate 7 are assembled, which requires a large number of assembly steps and reduces the workability of the assembly work. Moreover, there were other drawbacks such as thermal deformation of the members around the airtight seal part due to the heat generated during welding.

FIG. 2 shows another example of the conventional rotation prevention mechanism for the movable shaft 5, in which the joint surface of the end plate 7 with the bearing 6 is tightly joined to the external surface of the bearing 6. By bending the bearing 6 and firmly joining the outer surface of the bearing 6 and the joint surface of the end plate 7 with the bearing 6 through the adhesive 13, rotation of the movable shaft 5 can be prevented. It is composed of

However, in this configuration, the adhesive 1
3, it has a disadvantage in that it is easily peeled off, and in particular, it is easily peeled off when subjected to impact. Therefore, when assembling, inspecting, or replacing VI1, bearing 6 and end plate 7 are
This caused a phenomenon of separation between the two wheels and the loss of the anti-rotation function.

As described above, all of the conventional devices for preventing the rotation of the movable shaft in the cutter have drawbacks and are not satisfactory.

Purpose of the invention The present invention was devised in view of the problems of the prior art described above, and its purpose is to easily and reliably prevent rotation of the movable shaft with a simple configuration. The object of the present invention is to provide a device for preventing rotation of a movable shaft in a disconnector.

Structure of the invention The invention provides a movable shaft equipped with a movable contact at its inner end that can freely approach and separate from a fixed contact fixedly supported in a vacuum interrupter, and a spline shaft portion or a key groove portion of the movable shaft. In a device for preventing rotation of a movable shaft in a scissor cutter, in which an engaging portion to be fitted is supported so as to be movable in an axial direction via a bearing member provided on an inner circumferential surface thereof, the bearing member and the bearing member are provided. An end plate supporting the movable shaft is provided so as to be freely fixed via a fixing member, and an inner peripheral surface of the bearing insertion hole in the end plate is provided with an end plate that can be freely engaged with a groove in a spline shaft portion or a key groove portion of the movable shaft. By configuring an appropriate number of protrusions, the above object of the present invention is achieved. Hereinafter, embodiments of the present invention will be described in detail using the drawings from FIG. 4 onwards. In addition, in the following explanation, FIGS. 1 to 3
The same members as those shown in the figures are given the same reference numerals and their explanations will be omitted.

Embodiment of the invention FIG. 4 shows a first embodiment of the movable shaft rotation prevention device 14 according to the invention. The spline shaft portion (or a key groove etc. may be carved) 8 of the movable shaft 5 is a bearing having a spline groove (or key groove etc.) 9 carved on its inner circumferential surface to fit with the spline shaft portion 8. The bearing 6 is fixed to a bearing support portion 16 of an end plate 15 via a fixing member 17 such as a rivet.

A plurality of fixing members 17 are arranged in the inner circumferential direction of the bearing 6, and are configured to firmly and reliably fix the bearing 6 and the end plate 15. Fixed member 1
7 is, for example, a rivet sleeve 18 and a head 19a.
After the rivet sleeve 18 is fitted into the bearing 6 and the holes 20 and 21 of the end plate 15, the rivet shaft 19 is inserted into the rivet sleeve 18 and pulled. By tensioning, the end of the rivet sleeve 18 is connected to the bearing support portion 16 of the end plate 15 via the large diameter head 19a of the rivet shaft 19.
The bearing 6 and the end plate 15 can be fixed by caulking. Note that the fixing member 17 is not limited to the above configuration,
Other configurations may be used as long as the bearing 6 and the end plate 15 can be securely fixed.

As shown in FIG.
A protrusion 23 is provided to protrude and engage with a groove 22 in the spline shaft 8 . This protrusion 23
As shown in FIG. 5b, three protruding portions are provided at positions dividing the inner diameter surface portion of the bearing support portion 16 into three equal parts in the circumferential direction, and are configured to be elastically deformable in the axial direction. A notch 24 is preferably provided at the root of the protrusion 23 so that the protrusion 23 can be easily elastically deformed, as shown in FIG. Note that the number of the protrusions 23 is not limited to three, but can be set to an appropriate number.

In the above configuration, the operation of the present invention will be explained. When inserting the movable shaft 5 into a VI (vacuum interrupter), first only the movable shaft 5 is inserted into the axial hole of the end plate 15. During this insertion, the groove 22 of the spline shaft portion 8 of the movable shaft 5 and the protrusion 23 of the end plate 15 are engaged with each other, as shown in FIG. 5b. Therefore, in this inserted state, the movable shaft 5 is connected to the groove 22 and the protrusion 2.
3, its rotation is restricted.

The bearing 6 is inserted into the annular gap 25 (see FIG. 5b) between the movable shaft 5 whose rotation is restricted as described above and the end plate 15.
The hole 20 for inserting the fixing member 17 on the side and the hole 21 for inserting the fixing member 17 on the end plate 15 side are inserted so that they are compatible with each other. By fitting this bearing 6, the end plate 1
5 is elastically deformed in the axial direction as shown in FIG.
0 and 21 match each other, so these holes 20 and 21
Insert the rivet sleeve 18 into the rivet sleeve 18. Then, by inserting the rivet shaft 19 and pulling the rivet shaft 19 in the axial direction, the head 19a
The bearing 6 and the end plate 15 are fixed by the caulking action. Since the bearing 6 and the end plate 15 are fixed via the fixed member 17, and the bearing 6 and the movable shaft 5 are fitted together via the spline carved parts 9 and 8, rotation of the movable shaft 5 is prevented. will be regulated.

In particular, according to the present invention, the protrusion 2 that can freely engage with the groove 22 of the spline shaft portion (or key groove portion, etc.) 8 of the movable shaft 5 is provided on the inner peripheral surface of the axial hole of the end plate 15.
Since the bearing 6 and the holes 20, 21 for inserting the fixing member 17 in the end plate 15 can be easily matched and matched, both the holes 20, 21
The work of fixing both members 6 and 15 becomes extremely easy without using a matching jig. In addition, since the bearing 6 and the end plate 15 are easily and firmly fixed by the fixing member 17, the bond between the two members 6 and 15 will not come apart or loosen during assembly work, inspection, or replacement work. do not have. Therefore, rotation of the movable shaft 5 is always reliably prevented, and the function of the movable shaft 5 is always maintained. Also, due to the deformation of the rivet shaft 19 and the rivet sleeve 20 themselves, the bearing 6 and the end plate 15
Since the structure is such that the rotation of the movable shaft 5 is restricted by fixing the movable shaft 5, no distortion is given to the airtight shield portion of the VI, and the airtightness is maintained normally. Further, by using the above structure and an adhesive together, a better fixing effect can be obtained.

FIGS. 7a and 7b show a second embodiment of the present invention. The feature of this embodiment is that a notch 26 having a V-shaped cross section is formed at the base of the protrusion 23.
The protrusion 23 is configured to be easily elastically deformed by forming a thin wall at the base. Further, according to this configuration, the protrusion 2
3 can be removed as appropriate.

According to the above configuration, the elastic deformation of the protrusion 23 becomes easier, and therefore the work of inserting the bearing 6 becomes easier, and the workability of the assembly work can be improved. Note that the other configurations, functions, and effects are the same as those of the first embodiment, so their explanations will be omitted.

FIGS. 8a and 8b show a third embodiment of the present invention. The feature of this embodiment is that the bearing 6 can be inserted into the annular cavity 25 while the projection 23 of the end plate 15 is engaged with the groove 22 of the spline shaft 8 of the movable shaft 5. This is one point. That is, when the hole 20 of the bearing 6 and the hole 21 of the end plate 15 are aligned, a vertical groove 27 for escaping the projection 23 is formed in the shaft cylindrical portion 6b of the bearing 6 that interferes with the projection 23.
is formed so that the bearing 6 can be inserted into the annular cavity 25 without elastically deforming the protrusion 23. Therefore, the vertical groove 27 is the protrusion 23
A number corresponding to the number will be formed.

According to the above configuration, the hole 21 of the end plate 15 and the hole 20 of the bearing 6 are automatically connected by simply fitting the bearing 6 into the annular gap 25 between the end plate 15 and the spindle shaft portion 8. Since they match, alignment of the holes for inserting the fixing member 17 becomes extremely easy, and the workability of assembling the rotation prevention mechanism section of the movable shaft 5 is further improved. The other configurations, functions, and effects are the same as those of the first embodiment, so their explanations will be omitted.

Effects of the invention As described above, according to the invention, it is possible to firmly fix the bearing of the movable shaft and the end plate with extremely simple work, and it is possible to improve the workability of regulating the rotation of the movable shaft and to ensure the Rotation can be controlled. Also,
Since the fixing member mounting hole that fixes the bearing and end plate can be easily aligned, the rotation prevention mechanism of the movable shaft can be easily assembled, reducing assembly time and improving workability during assembly work. I can figure it out. moreover,
Since no means such as welding is used, thermal distortion etc. do not occur after the bearing and end plate are fixed, and the airtightness of the airtight part in the VI is maintained normally.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of VI of a general vacuum breaker, Figs. 2 and 3 are explanatory diagrams of the prior art, and Fig. 4 is a longitudinal cross-sectional view showing the first embodiment of the device according to the present invention. A side view, FIG. 5a is a vertical sectional view of a part of the main part of FIG. 4,
Fig. 5b is a plan sectional view of the main part of Fig. 4, Fig. 6 is a plan view showing the main part of the second embodiment of the invention, and Figs. 7a and b are the third embodiment of the invention. FIGS. 8a and 8b are explanatory views showing the main parts of the fourth embodiment of the present invention. 1... Vacuum interrupter (VI), 2... Fixed contact, 4... Movable contact, 5... Movable shaft, 6... Bearing, 15... End plate, 17... Fixed member, 23...
protrusion.

Claims (1)

[Scope of utility model registration request] A movable shaft 5, which is equipped with a movable contact 4 at its inner end that can freely move toward and away from a fixed contact 2 fixedly supported within the vacuum interrupter 1, is fitted into the spline shaft portion or key groove portion of the movable shaft 5. In a device for preventing rotation of a movable shaft in a shunt cutter, the device is configured to support an engaging portion so as to be movable in an axial direction via a bearing member provided on an inner circumferential surface of the engaging portion. An end plate is provided to be freely fixed via a fixing member, and a protrusion that can be freely engaged with a groove in a spline shaft portion or a key groove portion of the movable shaft 5 is provided on the inner circumferential surface of the bearing insertion hole in the end plate. Part 23
A device for preventing the rotation of a movable shaft in a shear cutter, characterized in that a suitable number of protruding portions are provided.