JP2019201499A - Termination connection - Google Patents

Abstract

To provide a terminal connection capable of suppressing generation of abnormal noise.SOLUTION: The terminal connection includes: an end of a cable where a conductor and a cable insulator are exposed in stages; a pre-molded insulator mounted on an outer periphery of the cable insulator; a bushing for housing the end of the cable and the pre-molded insulator; and a pressing device for pressing the pre-mold insulator from a rear end side to a front end side of the cable. The pressing device includes: a front end portion, disposed on an outer periphery of the cable insulator, in contact with the pre-mold insulator; a pressing portion having a rear end portion located on a rear end side of the cable of the front end portion; a plurality of shaft portions having one end fixed to the rear end portion and disposed parallel to the axial direction of the cable; a movable flange portion, disposed on the other end side of the plurality of shaft portions, capable of adjusting a position along the plurality of shaft portions; an elastic body that is attached to each shaft portion and urges the pressing portion toward the front end side of the cable with respect to the movable flange portion; and a vibration absorber disposed between each shaft portion and the elastic body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a termination connection.

  Patent Literature 1 discloses a cable connection unit for connecting a power cable to a power device such as a transformer. The cable connection portion includes a bushing, a cable terminal mounted in the bushing receiving port, a stress cone disposed between the bushing and the cable terminal, and a stress cone connected to the bushing in the distal direction (to the bushing of the cable terminal). A pressing device that presses in the insertion direction). The pressing device includes an annular pressing member that is held against the stress cone, an annular pressing member flange portion that is disposed on the rear end side of the pressing member, and a coil that is disposed between the pressing member and the pressing member flange portion. Shaped spring. The pressing device applies a biasing force due to the spring force of the spring to the pressing metal by pressing the pressing metal flange toward the bushing, and presses the stress cone against the bushing by the pressing metal.

JP 2014-68514 A

  The cable connection portion (terminal connection portion) can vibrate using the power device as a vibration source. When the terminal connection portion vibrates, abnormal noise may be generated due to the vibration. Depending on the timbre of the abnormal sound, it is similar to the sound of partial discharge caused by an electrical defect in the terminal connection part, and it is difficult to immediately determine the cause of the sound. Moreover, when abnormal noise occurs, it is necessary to stop power transmission.

  Therefore, an object of the present disclosure is to provide a termination connection unit that can suppress the occurrence of abnormal noise.

The termination connection according to the present disclosure is
The end of the cable in which the conductor and the cable insulator formed on the outer periphery of the conductor are exposed stepwise;
A pre-mold insulator that is attached in close contact with the outer periphery of the cable insulator;
A bushing for housing the end of the cable and the pre-molded insulator;
A pressing device that presses the pre-mold insulator from the rear end side to the front end side of the cable,
The pressing device is
A cylindrical member disposed on the outer periphery of the cable insulator, the pressing member having a front end portion that contacts the pre-molded insulator and a rear end portion located on the rear end side of the cable with respect to the front end portion And
A plurality of shaft portions having one end fixed to the rear end portion and arranged in parallel with the axial direction of the cable;
A movable flange portion disposed on the other end side of the plurality of shaft portions and capable of adjusting a position along the plurality of shaft portions;
An elastic body that is attached to each of the shaft portions and urges the pressing portion toward the distal end side of the cable with respect to the movable flange portion;
A vibration absorber disposed between the shafts and the elastic body.

  The said termination | terminus connection part can suppress generation | occurrence | production of abnormal sound.

FIG. 3 is a schematic partial longitudinal sectional view showing a terminal connection portion according to the first embodiment. It is a schematic longitudinal cross-sectional view which shows the axial rear end vicinity of the axial part in the press apparatus with which the termination | terminus connection part which concerns on Embodiment 2 is equipped. It is a schematic longitudinal cross-sectional view which shows another example of the press apparatus with which the termination | terminus connection part which concerns on Embodiment 2 is provided, and shows the axial rear end part vicinity of an axial part. It is the front view which looked at the press apparatus with which the termination | terminus connection part which concerns on Embodiment 3 is provided from the press flange part side. It is the schematic longitudinal cross-sectional view cut | disconnected by the (V)-(V) line | wire shown in FIG. It is the schematic longitudinal cross-sectional view cut | disconnected by the (VI)-(VI) line | wire shown in FIG. It is a graph which shows the test body A in a test example. It is a graph which shows the test body B in a test example. It is a graph which shows the test body C in a test example.

[Description of Embodiment of the Present Invention]
When the terminal connection portion vibrates, the pressing device that is one of the components can also vibrate. Then, when it was investigated whether or not an abnormal sound was generated when the pressing device vibrated, it was found that an abnormal sound was generated in the vicinity of the elastic body that was the source of the pressing force. In particular, as shown in a test example to be described later, it has been found that a large abnormal sound is generated when the natural frequencies of the members constituting the pressing device including the elastic body overlap. Based on the above findings, the present invention defines a configuration that suppresses vibration of the pressing device. First, the contents of the embodiment of the present invention will be listed and described.

(1) The termination connection according to the embodiment of the present invention is:
The end of the cable in which the conductor and the cable insulator formed on the outer periphery of the conductor are exposed stepwise;
A pre-mold insulator that is attached in close contact with the outer periphery of the cable insulator;
A bushing for housing the end of the cable and the pre-molded insulator;
A pressing device that presses the pre-mold insulator from the rear end side to the front end side of the cable,
The pressing device is
A cylindrical member disposed on the outer periphery of the cable insulator, the pressing member having a front end portion that contacts the pre-molded insulator and a rear end portion located on the rear end side of the cable with respect to the front end portion And
A plurality of shaft portions having one end fixed to the rear end portion and arranged in parallel with the axial direction of the cable;
A movable flange portion disposed on the other end side of the plurality of shaft portions and capable of adjusting a position along the plurality of shaft portions;
An elastic body that is attached to each of the shaft portions and urges the pressing portion toward the distal end side of the cable with respect to the movable flange portion;
A vibration absorber disposed between the shafts and the elastic body.

  The said termination | terminus connection part can adjust the elastic force of an elastic body by adjusting the position of a movable flange part along a some axial part. By urging the pressing portion toward the distal end side of the cable with respect to the movable flange portion by this elastic force, the premolded insulator can be pressed from the rear end side to the distal end side of the cable by the pressing portion. As a result, the pre-mold insulator can be in close contact with both the bushing and the cable insulator, and a predetermined surface pressure can be applied to the interface between the pre-mold insulator and the bushing and the interface between the pre-mold insulator and the cable insulator. it can.

  In the pressing device, the terminal connecting portion includes a vibration absorbing material between each shaft portion and the elastic body that are likely to vibrate, thereby suppressing vibration of each shaft portion and the elastic body. Therefore, it is possible to suppress the occurrence of abnormal noise.

  (2) As an example of the terminal connection part, the vibration absorbing material may be a resin or rubber tube.

  Since the vibration absorbing material is a resin or rubber tube, it is easy to dispose the vibration absorbing material between each shaft portion and the elastic body. Moreover, it is easy to suppress that each shaft part and the elastic body vibrate.

  (3) As an example of the terminal connection part, it may be further provided with an end side vibration absorbing material disposed between at least one of the shaft part and the movable flange part.

  Between the movable flange portion and each shaft portion, there is a gap in which the movable flange portion can be displaced along the plurality of shaft portions. For this reason, when the shaft portion and the movable flange portion vibrate respectively, abnormal sounds may be generated due to contact with each other. By providing the end-side vibration absorbing material in the gap, it is easy to suppress the vibration of the movable flange portion and each shaft portion, and it is possible to suppress the occurrence of abnormal noise due to contact with each other. The pressing device can suppress abnormal noise that can occur between the shaft portion and the elastic body, and can suppress abnormal noise that can occur between the movable flange portion and the shaft portion, among the members constituting the pressing device. It is easier to suppress the occurrence of abnormal noise from the whole.

  (4) As an example of the terminal connection portion, each shaft portion may include a free end that is not fixed to the movable flange portion on the other end side, and a connection plate that connects and fixes the free ends to each other. Can be mentioned.

  When each shaft portion is a free end, the shaft portion can vibrate on the free end side. By connecting and fixing these free ends with a connecting plate, it is easier to suppress the vibration of the shaft portion. Since the vibration of the shaft portion can be suppressed, it is easy to suppress the occurrence of abnormal noise due to the contact between the shaft portion and another member, and it is easier to suppress the generation of abnormal sound from the entire pressing device.

  (5) As an example of the terminal connection portion including the connection plate, a part of the plurality of shaft portions includes a male screw portion threaded to the free end, and the remaining portion of the plurality of shaft portions. The shaft portion may include a tapered portion at the free end.

  By providing the male screw portion at the free end of some shaft portions and the tapered portion at the free end of the remaining shaft portion, it is easy to firmly fix the connecting plate to the plurality of shaft portions. This is because it is possible to suppress the movement of the connecting plate with respect to the plurality of shaft portions by fitting the bush into the gap formed between the tapered portion and the connecting plate. By attaching the nut to the male screw portion, the connecting plate can be easily fixed to the plurality of shaft portions. In addition, when the free end of the shaft portion is provided with a tapered portion, the shaft portion can be easily passed through a through hole formed in the movable flange portion or the connecting plate.

  (6) As an example of the terminal connection portion, the pressing portion may include an annular recess that houses the end portion of the elastic body.

  By storing the elastic body in the recess, it is easy to define the radial position of the elastic body with respect to the shaft portion. Since the position of the elastic body can be defined, the distance between each shaft portion and the elastic body can be defined, interference between each shaft portion and the elastic body can be easily suppressed, and the occurrence of abnormal noise from the pressing device is further suppressed. Easy to do.

[Details of the embodiment of the present invention]
Embodiments of the present invention will be specifically described below with reference to the drawings. In the drawings, the same reference numerals denote the same names. In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to the claim are included.

<Embodiment 1>
The terminal connection part 1 which concerns on Embodiment 1 is demonstrated based on FIG. In FIG. 1, about the left half of the termination | terminus connection part 1, the longitudinal cross section cut | disconnected by the surface parallel to the axial direction of the electric power cable 100 is shown, and an external appearance is shown about a right half. FIG. 1 also shows an enlarged view of the vicinity of the elastic body 44 in the pressing device 40 provided in the terminal connection portion 1. Here, the termination connection portion 1 is an in-oil termination connection portion for connecting the power cable 100 to a power device (not shown) such as a transformer.

≪Terminal connection part≫
〔Overview〕
The terminal connection portion 1 includes an end portion of the power cable 100 (hereinafter, the cable end portion 10), a premolded insulator 20, a bushing 30, and a pressing device 40. The cable end 10 exposes the conductor 11 and the cable insulator 12 of the power cable 100 in a stepwise manner. The pre-mold insulator 20 is attached in close contact with the outer periphery of the cable insulator 12. The bushing 30 houses the cable end 10 and the premolded insulator 20. The pressing device 40 presses the premolded insulator 20 from the rear end side of the power cable 100 to the front end side.

  The pressing device 40 includes a pressing portion 41, a plurality of shaft portions 42, a movable flange portion 43, and an elastic body 44. The pressing portion 41 is disposed on the outer periphery of the cable insulator 12 and has a distal end portion (pressing distal end portion 411) that contacts the premolded insulator 20. The plurality of shaft portions 42 have one end (shaft tip portion 421) fixed to a rear end portion (pressed rear end portion 412) located on the rear end side of the power cable 100 in the pressing portion 41. Arranged parallel to the axial direction. The movable flange portion 43 is disposed on the other end side (the shaft rear end portion 422 side) of the plurality of shaft portions 42, and the position along the plurality of shaft portions 42 can be adjusted. The elastic body 44 is attached to each shaft portion 42 and urges the pressing portion 41 toward the distal end side of the power cable 100 with respect to the movable flange portion 43. The pressing device 40 can adjust the elastic force of the elastic body 44 by displacing the position of the movable flange portion 43 toward the distal end side of the power cable 100 along the plurality of shaft portions 42. Then, by pressing the pressing portion 41 toward the front end side of the power cable 100 by this elastic force, the premolded insulator 20 can be pressed from the rear end side of the power cable 100 to the front end side by the pressing portion 41.

  The terminal connection portion 1 of the first embodiment is characterized in that the pressing device 40 includes a vibration absorbing material 45 between each shaft portion 42 and the elastic body 44. Hereinafter, the structure of the termination | terminus connection part 1 is demonstrated in detail. In the following description, the front end side of the power cable 100 (the side where the conductor 11 is located in the state where the cable end portion 10 is accommodated in the bushing 30, the upper side of the drawing in FIG. 1) is the front end side, and the opposite side (in FIG. The lower side of the drawing is called the rear end side.

(Cable end)
The power cable 100 includes a conductor 11 and a cable insulator 12 formed on the outer periphery of the conductor 11 and is covered with a sheath 14. The power cable 100 in this example is a cross-linked polyethylene insulated vinyl sheath cable (CV cable). An inner semiconductive layer (not shown) is provided on the inner peripheral portion of the cable insulator 12, and an outer semiconductive layer 13 is provided on the outer peripheral portion. The end portion (cable end portion 10) of the power cable 100 is stripped, and the conductor 11, the cable insulator 12, and the external semiconductive layer 13 are exposed in order from the front end. A conductor lead bar 90 is compression-connected to the tip of the conductor 11.

[Pre-mold insulator]
The pre-molded insulator 20 includes an insulating portion 21 and a semiconductive portion 22 molded integrally with the insulating portion 21 on the rear end side of the insulating portion 21. The pre-mold insulator 20 is a member that is attached in close contact with the outer periphery of the cable insulator 12 and relaxes the electric field at the cable end 10 within the bushing 30. The semiconductive portion 22 of the premolded insulator 20 is connected to the external semiconductive layer 13. The premold insulator 20 has a spindle shape that tapers from the center toward both ends, and a circular hole into which the cable insulator 12 is inserted is formed at the center. The pre-mold insulator 20 has a tapered surface (tip surface 23) positioned on the front end side abutted against a contact surface 32 of a bushing 30 described later, and a tapered surface (rear end surface 24) positioned on the rear end side is described later. The pressing unit 41 of the pressing device 40 is pressed. The pre-mold insulator 20 is made of rubber such as ethylene propylene rubber or silicone rubber.

[Bushing]
The bushing 30 includes an insertion opening 31 into which the cable end 10 is inserted on the rear end side, and accommodates the cable end 10 and the premolded insulator 20 inside. The bushing 30 is a tubular member made of an insulating material, and is an epoxy sleeve in this example. The inner diameter of the insertion opening 31 is larger than the outer diameter of the central portion of the premolded insulator 20. The bushing 30 includes a tapered region whose inner diameter decreases from the insertion opening 31 toward the distal end side, and a uniform region whose inner diameter is substantially uniform from the tapered region toward the distal end side. The inner surface on the tip side of the tapered region is a tapered contact surface 32 corresponding to the tip surface 23 of the pre-mold insulator 20. The pre-mold insulator 20 is accommodated in the bushing 30 in a state where the tip surface 23 abuts against the contact surface 32.

  The bushing 30 is installed in a device case (not shown). The insertion opening 31 is provided with a bushing flange portion 33, and an adapter 50 for fixing to the bottom plate 200 of the device case is attached to the end surface of the bushing flange portion 33. An insulating cylinder 60 is attached to the adapter 50, and an intermediate flange portion 70 is attached to the rear end side of the insulating cylinder 60. The power cable 100 is immovable with respect to the bottom plate 200 of the device case. Therefore, the intermediate flange portion 70 is immovable with respect to the power cable 100 via the adapter 50 and the insulating cylinder 60. A shaft portion 433 for attaching the pressing device 40 described later is attached to the intermediate flange portion 70. Since the intermediate flange portion 70 does not move with respect to the power cable 100, the movable flange portion 43 described later moves in the longitudinal direction of the attachment shaft portion 433 with reference to the attachment shaft portion 433 attached to the intermediate flange portion 70. It is free. In addition, a cable protection fitting 80 is attached to the intermediate flange portion 70 to cover the vicinity of the end processing start of the cable end portion 10 (the vicinity of the start position of the portion subjected to the end processing).

[Pressing device]
The pressing device 40 includes a pressing part 41, a shaft part 42, a movable flange part 43, an elastic body 44, and a vibration absorbing material 45. The pressing device 40 urges the pressing portion 41 toward the distal end side with respect to the movable flange portion 43 by the elastic force of the elastic body 44 disposed between the pressing portion 41 and the movable flange portion 43, and the pressing portion 41 To press the pre-mold insulator 20 toward the tip side. As a result, the pre-mold insulator 20 is brought into close contact with both the bushing 30 and the cable insulator 12, and a predetermined amount is applied to the interface between the pre-mold insulator 20 and the bushing 30 and the interface between the pre-mold insulator 20 and the cable insulator 12. Of surface pressure.

(Pressing part)
The pressing portion 41 is a cylindrical member that is disposed on the outer periphery of the cable insulator 12 and is a member that directly presses the pre-molded insulator 20. The pressing portion 41 includes a pressing front end portion 411 disposed on the front end side and a pressing rear end portion 412 disposed on the rear end side. The pressing front end portion 411 and the pressing rear end portion 412 may be configured by independent members or may be configured by an integrally formed object. In this example, the pressing front end portion 411 and the pressing rear end portion 412 are composed of independent members.

  The pressing tip 411 contacts the premolded insulator 20. The inner surface of the pressing front end portion 411 on the front end side is a pressing surface 413 having a shape corresponding to the rear end surface 24 of the premolded insulator 20. The pressing front end 411 has an inner surface with a uniform inner diameter from the pressing surface 413 toward the rear end. The pressing tip 411 is a trumpet-shaped cylindrical member whose inner diameter increases toward the tip.

  The pressing rear end portion 412 is located on the rear end side with respect to the pressing front end portion 411 and contacts the end surface on the rear end side of the pressing front end portion 411. In this example, the pressing rear end portion 412 is a cylindrical member having a L-shaped cross section extending from the end surface on the rear end side to the inner surface of the pressing front end portion 411. The pressing rear end portion 412 has a cylindrical vertical portion 412a extending in the axial direction of the power cable 100, and a flange-shaped portion integrally formed with the vertical portion 412a and extending in a direction intersecting (orthogonal) with the axial direction of the power cable 100. A horizontal portion 412b. The outer diameter of the lateral portion 412b is larger than the outer diameter of the end surface on the rear end side of the pressing tip portion 411. A shaft portion 42 to be described later is fixed to the horizontal portion 412b by screw coupling.

  In this example, the lateral portion 412b of the pressing rear end portion 412 has an annular shape that houses an end portion (elastic body front end portion 441) on the front end side of the elastic body 44 described later around each fixed shaft portion 42. A recess 414 is provided. By accommodating the elastic body front end portion 441 in the recess 414, the position of the elastic body 44 with respect to each shaft portion 42 can be easily defined. Since the position of the elastic body 44 can be defined, the interval between each shaft portion 42 and the elastic body 44 can be defined, and interference between each shaft portion 42 and the elastic body 44 can be easily suppressed. In particular, if the central axis of the concave portion 414 and the central axis of the shaft portion 42 are coaxial, the distance between each shaft portion 42 and the elastic body 44 tends to be uniform in the circumferential direction. It is easy to suppress interference with 44.

  In this example, the pressing front end portion 411 and the pressing rear end portion 412 are combined to form a cylindrical pressing portion 41 having a side wall continuous in the circumferential direction as a whole. In addition, the pressing tip 411 and the pressing rear end 412 are both annular members, the pressing tip 411 and the pressing rear end 412 are connected by a plurality of rod-shaped members, and the pressing has a side wall intermittent in the circumferential direction. It can also be a part. The “tubular member” in the present invention includes a pressing portion having a side wall intermittent in the circumferential direction.

(Shaft)
Each shaft portion 42 has a tip end (shaft tip portion 421) threaded, and is fixed to the lateral portion 412b of the pressing rear end portion 412 by screw coupling. Each shaft portion 42 is disposed in parallel with the axial direction of the power cable 100. The plurality of shaft portions 42 are provided at equal intervals along the circumferential direction of the power cable 100 (14 in this example) (see also FIG. 4). The rear end portion (shaft rear end portion 422) of each shaft portion 42 is not fixed to a later-described movable flange portion 43 or the like, and is a free end. When the free end is tapered, each shaft portion 42 is easily passed through a through hole 431 of the movable flange portion 43 described later, and the pressing device 40 is easily assembled. The free end of the shaft portion 42 will be described in detail in a third embodiment to be described later.

(Movable flange)
The movable flange portion 43 is an annular member that is disposed on the rear end side (the shaft rear end portion 422 side) of the plurality of shaft portions 42 and is opposed to the lateral portion 412 b of the pressing rear end portion 412. The movable flange portion 43 includes a plurality of through holes 431 through which the plurality of shaft portions 42 respectively penetrate. The diameter of each through hole 431 is slightly larger than the outer diameter of each shaft portion 42. Therefore, the movable flange portion 43 is movable along the plurality of shaft portions 42 in a state where the respective shaft portions 42 are passed through the respective through holes 431, and the position along the plurality of shaft portions 42 can be adjusted. is there.

  The outer diameter of the movable flange portion 43 is larger than the outer diameter of the lateral portion 412 b of the pressing rear end portion 412. The movable flange portion 43 includes a plurality (eight in this example) of through holes 432 at equal intervals along the circumferential direction, radially outward from the plurality of through holes 431 (see also FIG. 4). A mounting shaft portion 433 is passed through each through hole 432. Each mounting shaft portion 433 is threaded at the end on the front end side, and is fixed to the intermediate flange portion 70 by screw connection. In addition, each mounting shaft portion 433 is also threaded at the end portion on the rear end side, and the nut 434 is coupled in a state of being penetrated through each through hole 432 of the movable flange portion 43, so that the movable flange portion 43 includes a plurality of movable flange portions 43. Mounted on the mounting shaft 433. The diameter of each through hole 432 is larger than the outer diameter of each mounting shaft portion 433. Therefore, the movable flange portion 43 is movable along the plurality of attachment shaft portions 433 in a state in which the respective attachment shaft portions 433 are passed through the respective through holes 432, and along the plurality of attachment shaft portions 433. The position can be adjusted. The movable flange portion 43 is displaced to the front end side or the rear end side along the plurality of mounting shaft portions 433 as the nut 434 rotates, and the movable flange portion 43 is stopped against the nut 434. Thus, the position of the rear end side of the mounting shaft portion 433 of the movable flange portion 43 is fixed.

  In this example, the movable flange portion 43 is provided with an annular recess 435 for accommodating a rear end portion (elastic body rear end portion 442) described later around the through hole 431. By accommodating the elastic body rear end 442 in the recess 435, the position of the elastic body 44 with respect to each shaft portion 42 can be easily defined. Since the position of the elastic body 44 can be defined, the interval between each shaft portion 42 and the elastic body 44 can be defined, and interference between each shaft portion 42 and the elastic body 44 can be easily suppressed. In particular, if the central axis of the concave portion 435 and the central axis of the shaft portion 42 are coaxial, the distance between each shaft portion 42 and the elastic body 44 is likely to be uniform in the circumferential direction. It is easy to suppress interference with 44. The elastic body front end portion 441 is housed in the concave portion 414 formed in the lateral portion 412 b of the pressing rear end portion 412, and the elastic body rear end portion 442 is housed in the concave portion 435 formed in the movable flange portion 43. This makes it easier to define the interval between each shaft portion 42 and the elastic body 44. Note that at least one of the elastic body front end portion 441 and the elastic body rear end portion 442 may be accommodated in the recesses 414 and 435, and only the elastic body front end portion 441 may be accommodated in the recess 414, or the elastic body. Only the rear end 442 may be accommodated in the recess 435.

(Elastic body)
The elastic body 44 is a coiled spring attached to the shaft portion 42. In this example, the elastic body 44 is a compression spring. The elastic body 44 has an elastic body front end portion 441 in contact with the pressing rear end portion 412 and an elastic body rear end portion 442 in contact with the movable flange portion 43. The elastic body 44 changes its elastic force as the movable flange portion 43 is displaced along the plurality of shaft portions 42. The elastic body 44 urges the pressing portion 41 toward the distal end side by an elastic force accompanying the displacement of the movable flange portion 43 along the plurality of shaft portions 42 toward the distal end side. The elastic body 44 may be a combination of disk spring groups.

(Vibration absorber)
The vibration absorbing material 45 is a member that is disposed between each shaft portion 42 and the elastic body 44 and suppresses the shaft portion 42 and the elastic body 44 from interfering with each other. The vibration absorbing material 45 may be a resin or rubber tube. Examples of the resin constituting the vibration absorbing material 45 include polyvinyl chloride (PVC) and polyethylene (PE). In this example, the vibration absorbing material 45 is arranged over the entire region covered with the elastic body 44 in the shaft portion 42.

  The vibration absorbing material 45 has a thickness of 0.05 mm or more and 0.5 mm or less, although depending on the distance between each shaft portion 42 and the elastic body 44. When the thickness of the vibration absorbing material 45 is 0.05 mm or more, it is easy to suppress the vibration of each shaft portion 42 and the elastic body 44. On the other hand, when the thickness of the vibration absorbing material 45 is 0.5 mm or less, an increase in size of the vibration absorbing material 45 can be suppressed, and an increase in size of the elastic body 44 can also be suppressed. The thickness of the vibration absorbing material 45 is further 0.1 mm or more and 0.5 mm or less.

≪Assembly method for terminal connection≫
An example of a method for assembling the end connection 1 according to the first embodiment will be described.

  First, the end portion of the power cable 100 is stripped to expose the conductor 11, the cable insulator 12, and the outer semiconductive layer 13 in a stepwise manner. The conductor lead rod 90 is fitted from the outer periphery of the exposed conductor 11 and compressed to connect the conductor 11 and the conductor lead rod 90. A pre-mold insulator 20 is attached to the outer periphery of the cable insulator 12. The pre-molded insulator 20 is attached to the cable insulator 12 after the cable end 10 is passed through the movable flange portion 43 of the pressing device 40 and the central hole of the pressing portion 41.

  The cable end 10 is inserted from the insertion opening 31 of the bushing 30 and accommodated in the bushing 30. The insertion of the cable end portion 10 into the bushing 30 is performed until the front end surface 23 of the pre-molded insulator 20 is stopped against the contact surface 32 of the bushing 30.

  A pressing device 40 is attached. First, the shaft portion 42 is screwed to the pressing rear end portion 412 and the mounting shaft portion 433 is screwed to the intermediate flange portion 70. Next, the elastic body 44 is attached to each shaft portion 42. At this time, the elastic body front end portion 441 is accommodated in the concave portion 414 formed in the pressing rear end portion 412. Thereafter, the shaft portion 42 is passed through each through hole 431 of the movable flange portion 43, the mounting shaft portion 433 is passed through each through hole 432, and the nut 434 is coupled to the end of the mounting shaft portion 433. At this time, the nut 434 is coupled so as to push the movable flange portion 43 toward the distal end side against the elastic force of the elastic body 44. By doing so, the pressing portion 41 can be urged toward the distal end side with respect to the movable flange portion 43 by the elastic force of the elastic body 44. Thereby, the pressing surface 413 of the pressing tip 411 presses the rear end surface 24 of the premold insulator 20 toward the tip, and the tip surface 23 of the premold insulator 20 presses the contact surface 32 of the bushing 30 toward the tip. .

≪Effect≫
The terminal connection portion 1 according to the first embodiment adjusts the elastic force of the elastic body 44 by displacing the position of the movable flange portion 43 along the plurality of shaft portions 42 to the front end side, and the pressing portion 41 is adjusted by this elastic force. By urging the front end side, the pre-mold insulator 20 can be pressed to the front end side by the pressing portion 41. As a result, the pre-mold insulator 20 can be in close contact with both the bushing 30 and the cable insulator 12, and a predetermined amount is provided at the interface between the pre-mold insulator 20 and the bushing 30 and the interface between the pre-mold insulator 20 and the cable insulator 12. The surface pressure can be given.

  In the pressing device 40, the end connection portion 1 includes the vibration absorbing material 45 between the shaft portions 42 and the elastic bodies 44 that are likely to vibrate, so that the shaft portions 42 and the elastic bodies 44 vibrate. It is possible to suppress the occurrence of abnormal noise due to vibration. Since the abnormal sound that can be generated from the pressing device 40 can be suppressed, it is possible to suppress the abnormal sound from being generated in the terminal connection portion 1 in the first place. Even if an abnormal sound due to other than the pressing device 40 due to partial discharge or the like is generated in the terminal connection portion 1, the pressing device 40 can be excluded as the cause of the abnormal sound, so it is easy to find the cause of the abnormal sound. .

<Embodiment 2>
A termination connection unit according to the second embodiment will be described with reference to FIGS. 2 and 3, the same reference numerals as those in the first embodiment are given to configurations having the same functions as those in the first embodiment. In the following, the present embodiment will be described focusing on differences from the first embodiment.

  In addition to the configuration of the termination connection unit 1 according to the first embodiment, the termination connection unit according to the second embodiment further includes an end side vibration absorption disposed between at least one shaft portion 42 and the movable flange portion 43. One of the features is that the material 46 is provided. In the case of the terminal connection portion 1 according to the first embodiment, the movable flange portion 43 has a gap that can be displaced along the plurality of shaft portions 42 between each shaft portion 42 and the movable flange portion 43. The end-side vibration absorber 46 is a member that suppresses interference between the shaft portion 42 and the movable flange portion 43 by being disposed in the gap. The end side vibration absorber 46 may be a resin or rubber tube. As the resin constituting the end side vibration absorbing material 46, PVC and PE are exemplified as in the case of the vibration absorbing material 45.

  The shaft portion 42 includes a shaft main body portion 422a and a male screw portion 422b formed at the shaft rear end portion 422. As shown in FIG. 2, the end side vibration absorbing material 46 can be continuously provided between the end surface on the rear end side of the vibration absorbing material 45 and the nut 423 coupled to the male screw portion 422b. That is, the end side vibration absorbing material 46 can be provided so as to extend to the shaft rear end portion 422 of the shaft portion 42 continuously to the vibration absorbing material 45. Since the end side vibration absorbing material 46 is arranged up to the shaft rear end portion 422 continuously to the vibration absorbing material 45, the end side vibration absorbing material 46 is movable with the shaft portion 42 regardless of the position of the movable flange portion 43 along the shaft portion 42. An end side vibration absorbing material 46 can be interposed between the flange portion 43 and the flange portion 43. In this case, the end-side vibration absorbing material 46 may be configured as an integral body integrally formed with the vibration absorbing material 45 or may be configured as a member independent of the vibration absorbing material 45. When the vibration absorbing material 45 and the end side vibration absorbing material 46 are separate members, they may be made of the same material or different materials.

  The shaft portion 42 can be provided with a region having an outer diameter smaller than that of the other portion on the male screw portion 422b side of the shaft main body portion 422a (not shown). In this case, there is a step between the region where the outer diameter of the shaft body 422a is large and the region where the outer diameter is small. The end side vibration absorbing material 46 can be provided between the step and the nut 423 coupled to the male screw portion 422b. When the end-side vibration absorbing material 46 is abutted against the step formed in the shaft main body 422a, the end-side vibration absorbing material 46 is interposed between the shaft 42 and the movable flange 43 as much as possible. It suffices that the vibration absorbing material 45 is not provided up to the end surface on the rear end side. This is because even if the position of the movable flange portion 43 is displaced along the shaft portion 42, the end portion side vibration absorbing material 46 is fixed by a step, and therefore it is difficult for a positional shift to occur.

  When the outer diameter of the male screw part 422b is smaller than the outer diameter of the shaft main body part 422a, the shaft part 42 has a step between the male screw part 422b and the shaft main body part 422a. As shown in FIG. 3, the end side vibration absorbing material 46 can include a hooking portion 461 that is hooked on the step. When the hook portion 461 is provided on the end side vibration absorbing material 46, the end side vibration absorbing material 46 only needs to be interposed between the shaft portion 42 and the movable flange portion 43. It does not need to be provided up to the end surface on the rear end side. This is because even if the position of the movable flange portion 43 is displaced along the shaft portion 42, the end portion side vibration absorbing material 46 is fixed by the hook portion 461, so that it is difficult for a positional shift to occur.

  By providing the end side vibration absorbing material 46 in the gap formed between each shaft portion 42 and the movable flange portion 43, it is easy to suppress the vibration of each shaft portion 42 and the movable flange portion 43, It is possible to suppress the occurrence of abnormal sounds due to contact with each other. The abnormal noise that can be generated between the shaft portion 42 and the elastic body 44 among the members constituting the pressing device 40 can be suppressed, and the abnormal noise that can be generated between the shaft portion 42 and the movable flange portion 43 is suppressed. By being able to do it, it is easier to suppress that abnormal sound is generated from the entire pressing device 40.

<Embodiment 3>
A termination connection unit according to the third embodiment will be described with reference to FIGS. 4 to 6, configurations having the same functions as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment. In the following, the present embodiment will be described focusing on differences from the first embodiment.

  In addition to the configuration of the termination connection unit 1 according to the first embodiment, the termination connection unit according to the third embodiment further includes a connection plate 47. In the case of the terminal connection portion 1 according to the first embodiment, each shaft portion 42 includes a free end that is not fixed to the movable flange portion 43 at an end portion on the rear end side (shaft rear end portion 422). The connecting plate 47 is an annular member that connects the free ends of the shaft portions 42 to each other.

  Here, a part of the plurality of shaft portions 42 includes a male screw portion 422b (FIG. 5) threaded to a free end, and the remaining shaft portion 42 of the plurality of shaft portions 42 has a free end. Is provided with a tapered portion 422c (FIG. 6). In this example, the shaft portion 42 including the male screw portion 422b has an outer diameter of the male screw portion 422b smaller than the outer diameter of the shaft main body portion, and has a step between the male screw portion 422b and the shaft main body portion.

  The connection plate 47 is smaller than the outer diameter of the movable flange portion 43 as shown in FIGS. 4 to 6, and is arranged on the rear end side of the movable flange portion 43 as shown in FIGS. 5 and 6. The connection plate 47 includes a plurality of through holes 471 through which the plurality of shaft portions 42 respectively pass. The diameter of each through-hole 471 is equal to or slightly larger than the outer diameter of the male screw portion 422b and smaller than the outer diameter of the shaft main body portion. Therefore, as shown in FIG. 5, the connecting plate 47 is stopped by a step formed by the shaft main body portion and the male screw portion 422 b in a state where each shaft portion 42 is passed through each through hole 471. The connecting plate 47 is fixed by being sandwiched between the step and the nut 423 by coupling the nut 423 to the male screw portion 422b in a state where the shaft portions 42 are passed through the through holes 471.

  As shown in FIG. 6, the shaft portion 42 including the tapered portion 422 c has a gap between the tapered portion 422 c and the connecting plate 47. This gap is filled with the bush 48. The bush 48 includes a bush main body portion 481 interposed between the tapered portion 422c and the connection plate 47, and a bush flange portion 482 extending in a direction parallel to the surface of the connection plate 47 from an end portion on the distal end side of the bush main body portion 481. Is provided. The bush body 481 has an outer diameter equal to the diameter of the through hole 471 of the connecting plate 47 and an inner diameter corresponding to the tapered portion 422c. The bush flange portion 482 has an outer diameter larger than the diameter of the through hole 471 of the connecting plate 47 and an inner diameter corresponding to the tapered portion 422c. For this reason, when the tapered portion 422c to which the bush 48 is mounted is passed through the through hole 471 of the connecting plate 47, the connecting plate 47 is abutted against the bush flange portion 482 and the gap between the tapered portion 422c is filled. It is done.

  When the shaft rear end portion 422 of each shaft portion 42 is a free end, by providing the connecting plate 47, it is possible to suppress the vibration of each shaft portion 42 at the free end, and the shaft portion 42 and the movable flange portion 43 are It is possible to suppress the occurrence of abnormal sounds due to contact with each other. The abnormal noise that can be generated between the shaft portion 42 and the elastic body 44 among the members constituting the pressing device 40 can be suppressed, and the abnormal noise that can be generated between the shaft portion 42 and the movable flange portion 43 is suppressed. By being able to do it, it is easier to suppress that abnormal sound is generated from the entire pressing device 40. Furthermore, by providing the end portion side vibration absorbing member 46 between the shaft portion 42 and the movable flange portion 43, it is easier to suppress the occurrence of abnormal noise from the entire pressing device 40.

[Test example]
A pressing device having a configuration for suppressing vibration was produced, and the presence or absence of occurrence of abnormal sound was examined. In this example, each test body simulating a pressing device was attached to a vibration tester, and the relationship between the natural frequency of each member constituting the pressing device and the occurrence of abnormal noise was examined.

[Specimen A]
As the test body A, a pressing rear end portion, a shaft portion, a movable flange portion, an elastic body, and a vibration absorbing material among the pressing portions were prepared. One end side of the shaft portion was fixed to the pressed rear end portion, an elastic body was mounted on the outer periphery of the shaft portion, and a vibration absorbing material was disposed between the shaft portion and the elastic body. The gap between the shaft portion and the elastic body was about 0.5 mm, and the thickness of the vibration absorbing material was 0.1 mm. A movable flange portion whose position along the plurality of shaft portions can be adjusted is mounted on the other end side of each shaft portion (see FIG. 1).

[Specimen B]
As the test body B, a pressing rear end portion, a shaft portion, a movable flange portion, an elastic body, and a connection plate among the pressing portions were prepared. One end side of the shaft portion was fixed to the pressing rear end portion, and an elastic body was mounted on the outer periphery of the shaft portion. A movable flange portion capable of adjusting the position along the plurality of shaft portions was mounted on the other end side of each shaft portion. Furthermore, the free ends on the other end side of the shaft portion were connected to each other with a connecting plate and fixed. In the free end, a part of the plurality of shaft portions is a male screw portion, and the remaining portion is a tapered portion, and thus the connection plate was fixed using a nut and a bush (see FIGS. 5 and 6). In addition, the test body B has nothing interposed between the shaft portion and the elastic body, and has a gap of about 0.5 mm.

[Specimen C]
As a comparative example, a test body C that does not have a configuration for suppressing vibration was manufactured. The test body C is the same as the test body A, except that the vibration absorbing material is not provided.

〔Test conditions〕
Each test specimen was placed on the vibration tester so that the rear end of the press was on the bottom. Then, the movable flange portion was displaced to the pressing rear end side to adjust the elastic force of the elastic body, and the pressing rear end portion was urged by this elastic force. In order to generate vibration in the radial direction (lateral direction) of the pressing part and movable flange part with a vibration tester, the acceleration is set to 1.0 m / s ² and the frequency is gradually increased from 5 Hz to 1000 Hz. Resonance peaks of the body, shaft, and movable flange were searched, and the presence or absence of abnormal noise was confirmed by human judgment. The result of the test body A is shown in FIG. 7, the result of the test body B is shown in FIG. 8, and the result of the test body C is shown in FIG. In both figures, the vertical axis represents acceleration, and the horizontal axis represents frequency. In both figures, a long dotted line indicates an elastic body, a short dotted line indicates a shaft portion, and a solid line indicates a movable flange portion.

  In the test body A in which the vibration absorbing material was interposed between the shaft portion and the elastic body, no abnormal sound was observed. From FIG. 7, it can be seen that in the specimen A, the natural frequencies of the members do not overlap. That is, in the test body A, it is thought that the vibration of each member could be suppressed. On the other hand, although there was a gap between the shaft part and the elastic body, the test body B in which the free ends of the shaft part were connected by the connecting plate produced a small abnormal sound. When FIG. 8 is seen, in the test body B, it turns out that the natural frequency of each member has overlapped (refer the part enclosed with the circle). In addition, the test body C having a gap between the shaft portion and the elastic body and having the free end of the shaft portion as it was produced an abnormal noise larger than that of the test body B. From FIG. 9, it can be seen that in the test sample C, the natural frequencies of the respective members overlap (see the circled portion). Here, comparing FIG. 8 and FIG. 9, it can be seen that the peak of the portion where the natural frequencies of the respective members overlap is smaller in FIG. 8 than in FIG. From this, it can be considered that there is an effect of vibration suppression when the free ends of the shaft portions are connected to each other rather than the state where the shafts are left as they are. For example, depending on the gap between the shaft portion and the elastic body, the thickness of the vibration absorbing material, etc., the shaft portion may vibrate on the free end side, but by connecting the free ends to each other, the vibration of the shaft portion can be reduced. It can be suppressed.

  The following additional notes are disclosed in relation to the embodiment of the present invention described above.

[Appendix]
In addition, the termination connection according to the embodiment is
The end of the cable in which the conductor and the cable insulator formed on the outer periphery of the conductor are exposed stepwise;
A pre-mold insulator that is attached in close contact with the outer periphery of the cable insulator;
A bushing for housing the end of the cable and the pre-molded insulator;
A pressing device that presses the pre-mold insulator from the rear end side to the front end side of the cable,
The pressing device is
A cylindrical member disposed on the outer periphery of the cable insulator, the pressing member having a front end portion that contacts the pre-molded insulator and a rear end portion located on the rear end side of the cable with respect to the front end portion And
A plurality of shaft portions having one end fixed to the rear end portion and disposed in parallel with the axial direction of the cable;
A movable flange portion disposed on the other end side of the plurality of shaft portions and capable of adjusting a position along the plurality of shaft portions;
An elastic body that is attached to each of the shaft portions and urges the pressing portion toward the distal end side of the cable with respect to the movable flange portion;
And a connecting plate for connecting and fixing free ends that are not fixed to the movable flange portion on the other end side of the shaft portion.

  When each shaft portion is a free end, the shaft portion can vibrate on the free end side. According to the above-described terminal connection portion, the free ends are connected and fixed to each other by the connection plate, so that vibration of the shaft portion can be suppressed, and abnormalities occur as the shaft portion and other members come into contact with each other. Generation of sound can be suppressed.

DESCRIPTION OF SYMBOLS 1 Termination connection part 100 Power cable 10 Cable end part 11 Conductor 12 Cable insulator 13 Outer semiconductive layer 14 Sheath 20 Premold insulator 21 Insulation part 22 Semiconductive part 23 Front end surface 24 Rear end face 30 Bushing 31 Insertion opening part 32 Surface 33 Bushing flange portion 40 Pressing device 41 Pressing portion 411 Pressing tip portion 412 Pressing rear end portion 412a Vertical portion 412b Horizontal portion 413 Pressing surface 414 Recess portion 42 Shaft portion 421 Shaft tip portion 422 Shaft rear end portion 422a Shaft body portion 422b Male screw portion 422c Taper portion 423 Nut 43 Movable flange portion 431, 432 Through hole 433 Mounting shaft portion 434 Nut 435 Recess 44 Elastic body 441 Elastic body front end portion 442 Elastic body rear end portion 45 Vibration absorber 46 End side vibration absorber 461 Hook Part 47 Linked play G 471 Through hole 48 Bushing 481 Bushing body 482 Bushing flange 50 Adapter 60 Insulating cylinder 70 Intermediate flange 80 Cable protection bracket 90 Conductor lead bar 200 Equipment case bottom plate

Claims (6)

The end of the cable in which the conductor and the cable insulator formed on the outer periphery of the conductor are exposed stepwise;
A pre-mold insulator that is attached in close contact with the outer periphery of the cable insulator;
A bushing for housing the end of the cable and the pre-molded insulator;
A pressing device that presses the pre-mold insulator from the rear end side to the front end side of the cable,
The pressing device is
A cylindrical member disposed on the outer periphery of the cable insulator, the pressing member having a front end portion that contacts the pre-molded insulator and a rear end portion located on the rear end side of the cable with respect to the front end portion And
A plurality of shaft portions having one end fixed to the rear end portion and arranged in parallel with the axial direction of the cable;
A movable flange portion disposed on the other end side of the plurality of shaft portions and capable of adjusting a position along the plurality of shaft portions;
An elastic body that is attached to each of the shaft portions and urges the pressing portion toward the distal end side of the cable with respect to the movable flange portion;
The terminal connection part provided with the vibration-absorbing material arrange | positioned between each said axial part and the said elastic body.   The terminal connection portion according to claim 1, wherein the vibration absorbing material is a tube made of resin or rubber.   Furthermore, the termination | terminus connection part of Claim 1 or Claim 2 provided with the edge part side vibration-absorbing material arrange | positioned between at least one said axial part and the said movable flange part. Each shaft portion includes a free end that is not fixed to the movable flange portion on the other end side,
The termination | terminus connection part of any one of Claims 1-3 provided with the connection plate which connects and fixes the said free ends mutually. A part of the plurality of shaft portions includes a male screw portion threaded to the free end,
The terminal portion of claim 4, wherein the remaining shaft portion of the plurality of shaft portions includes a tapered portion at the free end.   The terminal connection portion according to any one of claims 1 to 5, wherein the pressing portion includes an annular concave portion that houses an end portion of the elastic body.

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