JP2013201319A - Tap changer - Google Patents

Abstract

An assembly workability is facilitated while reducing the load on the shaft and improving the reliability of the apparatus.
A metal drive shaft 110, a current collecting contact 120 extending in the circumferential direction of the drive shaft 110 outside the drive shaft 110, and at least a part of an inner diameter side of the current collection contact 120 are sandwiched. The current collector contact 120 is slidable with respect to the drive shaft 110 while having an opening through which the drive shaft 110 is inserted in the center and electrically insulating the drive shaft 110 and the current collector contact 120. And an insulating member 190. In addition, a positioning member 180 that positions the current collecting contact 120 in the axial direction of the drive shaft 110 and a plurality of members that are spaced from each other on the same circumference around the current collecting contact 120 around the drive shaft 110. The output-side fixed contact and the drive shaft 110 are connected to the current collecting contact 120 and move around the circumference of the current collecting contact 120 around the drive shaft 110 as the drive shaft 110 rotates. And a movable contact that connects one output-side fixed contact selected from the plurality of output-side fixed contacts and the current collecting contact 120.
[Selection] Figure 7

Description

  The present invention relates to a tap changer.

  As a prior document disclosing the configuration of the tap changer, there is JP 2000-340434 A (Patent Document 1). In the tap changer described in Patent Document 1, an insulating cylinder is used as the axis of the tap selector, and a plurality of current collecting rings are arranged at predetermined intervals on the outer peripheral surface of the insulating cylinder. A plurality of movable contact portions are arranged along the longitudinal direction of the insulating cylinder.

JP 2000-340434 A

  Since the current collecting ring is in sliding contact with the movable contact portion, in the conventional tap changer, the current collecting ring is fixedly attached to the insulating cylinder using a fastening member. For this reason, a circumferential load is applied to the insulating cylinder via the current collecting ring, and in particular, the insulating shaft may be damaged when the load is concentrated on the fixing portion of the fastening member. Moreover, the workability | operativity at the time of attaching a current collection ring to an insulation cylinder using a fastening member was bad.

  The present invention has been made in view of the above problems, and an object thereof is to provide a tap changer that facilitates assembly workability while reducing the load on the shaft and improving the reliability of the apparatus. To do.

  A tap changer according to the present invention sandwiches at least a part of a metal drive shaft, a current collecting contact extending outside the drive shaft in the circumferential direction of the drive shaft, and an inner diameter side of the current collecting contact. An insulating member having an opening through which the drive shaft is inserted in the center and electrically insulating the drive shaft and the current collecting contact while allowing the current collecting contact to slide relative to the drive shaft; Is provided. Further, the tap changer includes a positioning member for positioning the current collecting contact in the axial direction of the drive shaft, and a plurality of members positioned on the same circumference around the current collecting contact with the drive shaft as a center. The output side fixed contact is connected to the drive shaft, and as the drive shaft rotates, the drive shaft slides around the current collector contact around the drive shaft and moves to the current collector contact. One output side fixed contact selected from the side fixed contacts and a movable contact for connecting the current collecting contact are provided. Further, the tap changer includes an input-side fixed terminal, an input-side fixed terminal, and a current collecting contact that are spaced apart from the plurality of output-side fixed contacts on a circumference where the plurality of output-side fixed contacts are located. And a connection conductor for electrically connecting the two.

  According to the present invention, assembly workability can be facilitated while reducing the load on the shaft and improving the reliability of the apparatus.

It is a side view showing the appearance of the tap changer concerning one embodiment of the present invention. It is a partial cross section figure showing the internal structure of the tap changer concerning the embodiment. It is sectional drawing seen from the III-III line arrow direction of FIG. It is a top view which shows the structure of the current collection contactor which concerns on the same embodiment. It is a top view which shows the structure of the plate-shaped member contained in the insulating member which concerns on the same embodiment. It is a side view which shows the snap fit structure of the snap fit member contained in the insulating member which concerns on the embodiment. It is sectional drawing seen from the VII-VII line arrow direction of FIG. It is the top view seen from the arrow VIII direction of FIG. It is sectional drawing which looked at the engagement state of the insulating member which concerns on the embodiment from the IX-IX line arrow direction of FIG.

  Hereinafter, a tap changer according to an embodiment of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

  FIG. 1 is a side view showing an appearance of a tap changer according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view showing the internal structure of the tap changer according to the present embodiment. 3 is a cross-sectional view seen from the direction of arrows III-III in FIG. FIG. 4 is a plan view showing the structure of the current collecting contact according to the present embodiment.

  FIG. 5 is a plan view showing a structure of a plate-like member included in the insulating member according to the present embodiment. FIG. 6 is a side view showing a snap-fit structure of a snap-fit member included in the insulating member according to the present embodiment. FIG. 7 is a cross-sectional view seen from the direction of arrows VII-VII in FIG. FIG. 8 is a plan view seen from the direction of arrow VIII in FIG.

  The tap changer is a device for selecting one tap from a plurality of taps of the winding of the transformer. The tap is a drawing connection point provided in the middle of the transformer winding, and the tap of the transformer is connected to the fixed contact by a tap lead (not shown). The tap is divided into an odd-numbered tap group and an even-numbered tap group.

  As shown in FIGS. 1 to 3, the tap changer 100 according to the present embodiment includes a substantially cylindrical insulating cylinder 150. The insulating cylinder 150 is made of an insulating material, and is made of, for example, a glass fiber reinforced plastic containing an epoxy resin.

  The tap changer 100 has a metal drive shaft 110 located at the center of the insulating cylinder 150. A Geneva gear mechanism that rotationally drives the drive shaft 110 is connected to the upper portion of the drive shaft 110.

  The tap changer 100 has a current collecting contact 120 that extends in the circumferential direction of the drive shaft 110 outside the drive shaft 110. The current collecting contact 120 is made of a conductive material.

  In the present embodiment, since the tap is divided into the odd-numbered tap group and the even-numbered tap group, two current collecting contacts 120 are required for one phase of the power source. Moreover, in this embodiment, since the transformer is used with a three-phase power source, the tap changer 100 has six current collecting contacts 120. The six current collecting contacts 120 are spaced apart from each other in the axial direction of the drive shaft 110. The number of current collecting contacts 120 is not limited to six and may be one or more.

  As shown in FIG. 4, the current collecting contact 120 has a substantially annular outer shape. The current collecting contact 120 has a sliding contact portion 121 that is a portion that makes sliding contact with a movable contact 140 described later. As shown in FIG. 2, the sliding contact portion 121 has a substantially annular shape in the cross section.

  The current collecting contact 120 has a clamped portion 123 that extends from the sliding contact portion 121 toward the inner diameter side and is clamped by an insulating member 190 described later. The sandwiched portion 123 has a substantially flat shape in cross section.

  The current collecting contact 120 has a plurality of bent portions positioned so as to sandwich the sandwiched portion 123 therebetween in the circumferential direction. Specifically, bent portions 124a and 125a bent toward the back side in the depth direction of the paper surface in FIG. 4 and bent portions 124b and 125b bent toward the front side are provided.

  The current collecting contact 120 has an input part 122 connected to a connection conductor 170 described later. The input part 122 is bent from the inner diameter side of the sliding contact part 121 to the near side in the depth direction of the paper in FIG.

  The tap changer 100 has a plurality of output-side fixed contacts 160 that are located at intervals from each other on the same circumference around the current collecting contact 120 around the drive shaft 110. In the present embodiment, seven output side fixed contacts 160 are provided on the same circumference. The output side fixed contact 160 is made of a conductive material such as copper. Note that the number of output side fixed contacts 160 is not limited to seven, and may be plural.

  Further, the tap changer 100 has an input-side fixed terminal 161 that is positioned at a distance from the seven output-side fixed contacts 160 on the circumference where the seven output-side fixed contacts 160 are located. In the present embodiment, the six input-side fixed terminals 161 are located at intervals in the axial direction of the drive shaft 110. The input side fixed terminal 161 is made of a conductive material such as copper.

  The tap changer 100 includes a connection conductor 170 that electrically connects the input-side fixed terminal 161 and the current collecting contact 120. The connection conductor 170 is made of a conductive material. In the present embodiment, the six connection conductors 170 are spaced from each other in the axial direction of the drive shaft 110, and each connection conductor 170 electrically connects the input-side fixed terminal 161 and the current collecting contact 120. doing. The current collecting contact 120 is positioned in the circumferential direction by being connected to the connection conductor 170.

  In the tap changer 100, it is connected to the drive shaft 110, and moves while sliding on the current collecting contact 120 around the current collecting contact 120 around the drive shaft 110 as the drive shaft 110 rotates. In addition, a movable contact 140 that connects one output-side fixed contact 160 selected from the plurality of output-side fixed contacts 160 and the current collecting contact 120 is provided.

  Specifically, six movable contacts 140 are attached to a rod-like member 132 provided in parallel with the drive shaft 110 at intervals in the axial direction of the rod-like member 132. Both ends of the rod-shaped member 132 are connected to two arm portions 131 attached to the drive shaft 110, respectively. The two arm portions 131 and the rod-shaped member 132 constitute a drive support mechanism 130 for the movable contact 140.

  When the drive shaft 110 is rotationally driven by the Geneva gear mechanism, the drive support mechanism 130 rotates the movable contact 140 in the circumferential direction with the drive shaft 110 as a rotational axis. At this time, one end of the movable contact 140 is always in contact with the sliding contact portion 121 of the current collecting contact 120. The other end of the movable contact 140 is in contact with any of the seven output-side fixed contacts 160 or in non-contact with all of the output-side fixed contacts 160. The output-side fixed contact 160 that is in contact with the other end of the movable contact 140 is electrically connected to the current collecting contact 120 by the movable contact 140.

  In this way, one output-side fixed contact 160 electrically connected from the seven output-side fixed contacts 160 is selected, and the load current input to the tap changer 100 from the input-side fixed terminal 161 is: It is output from the selected output side fixed contact 160.

  In the tap changer 100, the clamped portion 123 that is at least a part of the current collecting contact 120 on the inner diameter side is sandwiched, and an opening through which the drive shaft 110 is inserted is provided at the center. An insulating member 190 that allows the current collecting contact 120 to be slidable with respect to the drive shaft 110 while being electrically insulated from the contact 120 is provided.

  As shown in FIGS. 5, 7, and 8, in this embodiment, the insulating member 190 includes an opening 191 a and two resin-made plate-like members 191 each having electrical insulation. As a material of the plate-like member 191, for example, a polyamide resin such as Rilsan (registered trademark) can be used. In the present embodiment, the plate member 191 is formed by injection molding.

  The two plate-like members 191 have the same shape. Therefore, compared with the case where the two plate-shaped members 191 have different shapes, the number of molds used for injection molding can be reduced.

  As shown in FIG. 5, the plate-like member 191 has an opening 191a in the center, and extends from the edge of the opening 191a to one side in the radial direction and the other side opposite to the one side. have.

  A cutout portion 191c is provided at the edge of the flat plate portion 191b on one side. Further, the flat plate portion 191b on one side is provided with a convex portion 191e which is an engaging portion.

  The convex portion 191e has a substantially cylindrical outer shape and bulges from both surfaces of the flat plate portion 191b. Moreover, the convex part 191e has the penetration groove part 191f extended in the radial direction of the convex part 191e, and penetrated in the thickness direction.

  The through groove portion 191f extends in a direction orthogonal to the extending direction of the flat plate portion 191b. Further, the through groove portion 191f penetrates in the extending direction of the through groove portion 191f on one surface side of the flat plate portion 191b, and both ends in the extending direction of the through groove portion 191f are blocked on the other surface side of the flat plate portion 191b. ing.

  The other flat plate portion 191b is provided with a through hole 191d which is an engaged portion that engages with the engaging portion. The through hole 191d is substantially circular in plan view, and has a diameter slightly larger than the outer diameter of the convex portion 191e. A bulging portion bulging from the other surface of the flat plate portion 191b is provided at the edge of the through hole 191d.

  The center of the through hole 191d and the center of the convex portion 191e are located point-symmetrically with respect to the center of the opening 191a. The two plate-like members 191 are configured such that the through-holes 191d and the convex portions 191e are fitted together when the one surface and the other surface are combined by rotating 180 ° relative to each other.

  Thus, the two plate-like members 191 have both the convex portions 191e and the through holes 191d that are engaged with each other. In each of the two plate-like members 191, the convex portion 191 e of one plate-like member 191 and the through-hole 191 d of the other plate-like member 191 are engaged, and the through-hole 191 d of one plate-like member 191 is engaged. And the projection 191e of the other plate member 191 are engaged with each other, the opening 191a of the one plate member 191 and the opening 191a of the other plate member 191 overlap each other. The opening of the insulating member 190 is configured by the overlapping opening 191a. The diameter of this opening is slightly larger than the diameter of the drive shaft 110.

  The insulating member 190 includes a snap-fit structure, and the two plate-like members 191 are integrally combined with each other by the snap-fit structure. In the present embodiment, the insulating member 190 includes a snap fit member 192.

  As shown in FIG. 6, the snap fit member 192 is formed in a hook shape at the base portion 192a, a leaf spring portion 192b extending in parallel with a predetermined distance from the base portion 192a, and a tip of the leaf spring portion 192b. Holding part 192c.

  FIG. 9 is a cross-sectional view of the engaged state of the insulating member according to the present embodiment as viewed from the direction of arrows IX-IX in FIG. In order to configure the insulating member 190 as shown in FIGS. 7 to 9, first, the two plate-like members 191 are combined as described above, and snapped into the through groove portion 191f and the through hole 191d of the convex portion 191e. The fit member 192 is inserted.

  While the holding portion 192c of the snap fit member 192 passes through the through groove portion 191f and the through hole 191d, the leaf spring portion 192b is bent by its own elasticity. After the holding portion 192c of the snap fit member 192 passes through the through hole 191d, the snap fit member 192 returns to its original shape due to the elasticity of the leaf spring portion 192b.

  As a result, the base portion 192a of the snap fit member 192 and the convex portion 191e are in contact with each other, and the holding portion 192c of the snap fit member 192 and the bulging portion of the through hole 191d are in contact with each other. Are combined together so as to press each other.

  The sandwiched portion 123 of the current collecting contactor 120 is sandwiched between the flat plate portions 191b of the two plate-like members 191 that are combined in this way.

  At this time, as shown in FIG. 8, each of the notch portions 191 c of the two plate-like members 191 is engaged with the bent portion 124 a or the bent portion 124 b of the current collecting contact 120. Further, each of the flat plate portions 191 b of the two plate-like members 191 is engaged with the bent portion 125 a or the bent portion 125 b of the current collecting contact 120. As a result, the two plate-like members 191 are positioned in the circumferential direction of the current collecting contact 120, respectively.

  The current collecting contact 120 integrated with the insulating member 190 is slidable with respect to the drive shaft 110 when the drive shaft 110 is inserted through the opening of the insulating member 190.

  The tap changer 100 has a positioning member that positions the current collecting contact 120 in the axial direction of the drive shaft 110. In the present embodiment, a retaining ring 180 is used as a positioning member. A retaining ring groove into which the retaining ring 180 is fitted is formed in the drive shaft 110 in advance. The current collecting contact 120 can be positioned in the axial direction of the drive shaft 110 by fitting the retaining rings 180 on the upper and lower sides of the insulating member 190 loosely inserted into the drive shaft 110.

  In the present embodiment, the current collecting contact 120 can be easily attached to the drive shaft 110 by inserting the drive shaft 110 through the opening of the insulating member 190 and supporting the insulating member 190 using the retaining ring 180. . Therefore, the assembly workability of the tap changer 100 is facilitated.

  Further, since the drive shaft 110 and the current collecting contact 120 are not directly fixed, it is possible to suppress a load on the drive shaft 110 via the current collecting contact 120. In particular, the use of the resin plate member 191 reduces the frictional resistance on the sliding surface between the drive shaft 110 and the opening 191a of the plate member 191 due to the self-lubricating property of the plate member 191. it can. As a result, the load on the drive shaft 110 can be reduced and the reliability of the tap changer 100 can be improved.

  The contact area between the drive shaft 110 and the arm portion 131 of the drive support mechanism 130 is larger than the contact area between the drive shaft 110 and the insulating member 190, and the load is shared by the two arm portions 131. Therefore, the load on the drive shaft 110 via the drive support mechanism 130 is relatively small. Further, since metal is used as the material of the drive shaft 110, the drive shaft 110 can be given higher strength than the insulating cylinder. Therefore, it is possible to reduce the load on the drive shaft 110 and reduce the possibility that the drive shaft 110 is damaged.

  Furthermore, in this embodiment, since the through groove portion 191f extends in a direction orthogonal to the extending direction of the flat plate portion 191b, the through groove portion 191f extends in the extending direction of the flat plate portion 191b. Compared with the case, the installation space of the snap fit member 192 in the extending direction of the flat plate portion 191b can be reduced. Therefore, the length in the extending direction of the plate-like member 191 can be shortened. As a result, the insulating member 190 and the current collecting contact 120 can be reduced, and the tap changer 100 can be reduced in size.

  The positioning member is not limited to the retaining ring, and for example, a pipe having an inner diameter slightly larger than the diameter of the drive shaft 110 may be used. A plurality of pipes are loosely inserted into the drive shaft 110, the plurality of pipes are stacked from the lower end side of the drive shaft 110, and the current collecting contact 120 integrated with the insulating member 190 is disposed between the pipes. Thus, the current collecting contact 120 may be positioned in the axial direction of the drive shaft 110.

  Alternatively, the connection conductor 170 may also serve as a positioning member. That is, the current collecting contact 120 may be positioned in the axial direction of the drive shaft 110 by connecting the input portion 122 of the current collecting contact 120 and the connection conductor 170.

  In the present embodiment, the two plate-like members 191 have the same shape, but the two plate-like members may have different shapes. For example, a plate-like member having two convex portions and a plate-like member having two through holes may be used so that the two snap-fit members 192 can be inserted from one surface side of the plate-like member. In this case, since the snap fit member 192 can be inserted from one direction, the assembly of the insulating member is facilitated.

  Or the snap fit structure may be provided in the plate-shaped member. That is, one plate-like member is formed with a hook-shaped holding portion, and the other plate-like member is formed with a recess that engages with the holding portion, and these two plate-like members are combined and used as an insulating member. May be. In this case, the number of parts can be reduced.

  Further, in the present embodiment, the insulating member 190 has a structure for sandwiching the sandwiched portion 123 of the current collecting contactor 120. However, the present invention is not limited to this. For example, the insulating member 190 has a current collecting contact only from below. The structure which supports the child 120 may be sufficient. Even in this structure, since the connection conductor 170 and the input part 122 of the current collecting contact 120 are connected, the current collecting contact 120 can be supported.

  In addition, the said embodiment disclosed this time is an illustration in all the points, Comprising: It does not become a basis of limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the scope of claims. Further, all modifications within the meaning and scope equivalent to the scope of the claims are included.

  100 Tap changer, 110 Drive shaft, 120 Current collecting contact, 121 Sliding contact part, 122 Input part, 123 Clamping part, 124a, 124b, 125a, 125b Bending part, 130 Drive support mechanism, 131 Arm part, 132 Bar shape Member, 140 Movable contact, 150 Insulating cylinder, 160 Output side fixed contact, 161 Input side fixed terminal, 170 Connection conductor, 180 Retaining ring, 190 Insulating member, 191 Plate member, 191a Opening, 191b Flat plate portion, 191c Notch part, 191d through hole, 191e convex part, 191f through groove part, 192 snap fit member, 192a base part, 192b leaf spring part, 192c holding part.

Claims (6)

A metal drive shaft;
Current collecting contacts extending in the circumferential direction of the drive shaft outside the drive shaft;
Holding at least a part of the inner diameter side of the current collecting contact and having an opening through which the drive shaft is inserted at the center, while electrically insulating the drive shaft and the current collecting contact An insulating member capable of sliding the current collecting contact with respect to the drive shaft;
A positioning member for positioning the current collecting contact in the axial direction of the drive shaft;
A plurality of output-side fixed contacts that are spaced apart from each other on the same circumference around the current collecting contact around the drive shaft;
The plurality of output sides connected to the drive shaft and slidably contact with the current collector contact on the circumference of the current collector contact around the drive shaft as the drive shaft rotates. A movable contact for connecting one output-side fixed contact selected from the fixed contacts and the current collecting contact;
On the circumference where the plurality of output-side fixed contacts are located, the input-side fixed terminals located at intervals from the plurality of output-side fixed contacts,
A tap changer comprising a connection conductor for electrically connecting the input-side fixed terminal and the current collecting contact. The insulating member includes two plate-shaped members made of resin each having an opening and electrical insulation,
The tap changer according to claim 1, wherein the two plate-like members sandwich the part on the inner diameter side of the current collecting contact between each other.   The tap changer according to claim 2, wherein the two plate-like members have the same shape.   The two plate-like members each have both an engaging portion and an engaged portion that engage with each other, and each of the two plate-like members includes an engaging portion of one plate-like member and the other The engaged portion of the plate-like member is engaged, and the engaged portion of the one plate-like member and the engaged portion of the other plate-like member are engaged, The tap changer according to claim 3, wherein the opening of the plate member and the opening of the other plate member overlap each other. The insulating member includes a snap-fit structure,
The tap changer according to claim 4, wherein the two plate-like members are integrally combined with each other by the snap-fit structure.   The tap changer according to claim 1, wherein the connection conductor also serves as the positioning member.

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