Feed-through structure

Abstract

This feed-through structure (100) comprises: an end surface plate (101) for a pressure-resistant housing; a power feed pipe (102) that passes through the end surface plate (101); a cap (103) that is provided to the end surface plate (101) and covers the power feed pipe (102); and an insulating liquid (104) that fills the inside space of the cap (103). The feed-through structure (100) is, for example, applied to an optical submarine relay. The insulating liquid (104) is typically an insulating oil or a fluorine inert fluid. The end surface plate (101) is typically composed of beryllium copper (BeCu).

Description

[Technical Field]

[0001] The present disclosure relates to feedthrough structures. [Background technology]

[0002] Patent Document 1 discloses an optical submarine repeater to be installed on the seabed. The optical submarine repeater includes a pressure-resistant housing that can withstand the water pressure of the deep sea, an optical signal amplifier housed in the pressure-resistant housing, and an insulating liquid filled in the pressure-resistant housing. Patent Document 1 also describes how, instead of filling the entire internal space of the pressure-resistant housing with insulating liquid, the insulating liquid can be filled only in areas that require high dielectric strength, such as the optical signal amplifier, thereby reducing the amount of insulating liquid used. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-327061 Summary of the Invention [Problem to be solved by the invention]

[0004] However, although Patent Document 1 proposes filling an insulating liquid only in areas where high dielectric strength is required, it does not disclose any specific configuration for doing so.

[0005] An object of the present disclosure is to provide a technology that achieves insulation between an end plate of a pressure-resistant housing and a feed pipe using a small amount of insulating liquid. [Means for solving the problem]

[0006] According to an aspect of the present disclosure, there is provided a feed-through structure comprising an end plate of a pressure-resistant housing, a power feed tube penetrating the end plate, a cup attached to the end plate and covering the power feed tube, and an insulating liquid filled in the internal space of the cup. [Effects of the Invention]

[0007] According to the present disclosure, insulation between the end plate of the pressure-resistant housing and the feed pipe can be achieved with a small amount of insulating liquid. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram of a feed-through structure (first embodiment). [Figure 2] 10 is a front cross-sectional view of an optical repeater (second embodiment). [Figure 3] 10 is a perspective view of a feed-through structure (second embodiment). [Figure 4] 10 is a cross-sectional view of a feed-through structure (second embodiment). [Figure 5] 5 is an enlarged view of part A in FIG. 4 (second embodiment). [Figure 6] 10 is a cross-sectional view of a feed-through structure (third embodiment). [Figure 7] 8 is an enlarged view of part B in FIG. 7 (third embodiment). DETAILED DESCRIPTION OF THE INVENTION

[0009] (First embodiment) A first embodiment of the present disclosure will now be described with reference to Fig. 1. Fig. 1 shows a schematic diagram of a feedthrough structure 100.

[0010] 1, feed-through structure 100 includes end plate 101 of a pressure-resistant housing, power feed pipe 102 that penetrates end plate 101, cup 103 that is attached to end plate 101 and covers power feed pipe 102, and insulating liquid 104 that fills the internal space of cup 103. With the above configuration, insulation between end plate 101 of the pressure-resistant housing and power feed pipe 102 can be achieved with a small amount of insulating liquid 104.

[0011] (Second embodiment) Next, a second embodiment will be described with reference to FIGS.

[0012] Fig. 2 shows a cross-sectional view of the optical submarine repeater 1. Fig. 3 shows a perspective view of the feed-through structure E. Fig. 4 shows a cross-sectional view of the feed-through structure E. Fig. 5 is an enlarged view of part A in Fig. 4.

[0013] As shown in FIG. 2, the optical submarine repeater 1 includes a pressure-resistant housing 2, an internal unit 3, two feedthroughs 4, and two tail cables 5.

[0014] The pressure-resistant housing 2 includes a hollow cylindrical pressure-resistant housing main body 10 and two end plates 11. The two end plates 11 are attached to an open end 10a of the pressure-resistant housing main body 10. The two end plates 11 close the open end 10a of the pressure-resistant housing main body 10.

[0015] The internal unit 3 typically includes an optical signal amplifier that amplifies an optical signal. The internal unit 3 is housed in the internal space 2a of the pressure-resistant housing 2. The internal unit 3 operates by receiving power from the submarine cable connected to the tail cable 5.

[0016] Each feedthrough 4 is provided in each end plate 11 and connects each tail cable 5 to the internal unit 3 .

[0017] Below, one of the two feedthroughs 4, the end face plate 11 corresponding to this feedthrough 4, and the tail cable 5 will be described, and the description of the other will be omitted.

[0018] 3 and 4, the end plate 11 is formed in the shape of a solid cylinder. As shown in Fig. 4, the end plate 11 is provided radially inward of the corresponding open end 10a of the pressure-resistant housing main body 10. The end plate 11 includes an end plate main body 12, a cone 13, and a nut 14. The end plate main body 12, the cone 13, and the nut 14 are all made of conductive metal, for example, beryllium copper (BeCu).

[0019] The end plate body 12 has an inner surface 12a that defines the internal space 2a of the pressure-resistant housing 2 and an outer surface 12b facing the opposite side of the inner surface 12a. A through hole 15 extending in the axial direction of the pressure-resistant housing 2 is formed in the end plate body 12. Hereinafter, the term "axial direction" simply refers to the axial direction of the pressure-resistant housing 2. Similarly, the term "radial direction" simply refers to the radial direction of the pressure-resistant housing 2. The through hole 15 opens to the inner surface 12a and the outer surface 12b. The inner surface of the through hole 15 is composed of a high-pressure-side straight inner surface 15a, a tapered inner surface 15b, and a low-pressure-side straight inner surface 15c. The high-pressure-side straight inner surface 15a, the tapered inner surface 15b, and the low-pressure-side straight inner surface 15c are connected in this order from the outer surface 12b to the inner surface 12a. The high-pressure-side straight inner surface 15a extends parallel to the axial direction. The tapered inner peripheral surface 15b has a diameter that decreases toward the internal space 2a of the pressure-resistant casing 2. The low-pressure-side straight inner peripheral surface 15c extends parallel to the axial direction.

[0020] The cone 13 is disposed within the through-hole 15 of the end plate body 12. The cone 13 has a straight outer peripheral surface 13a, a tapered outer peripheral surface 13b, and a tip surface 13c. The straight outer peripheral surface 13a, the tapered outer peripheral surface 13b, and the tip surface 13c are connected in this order from the outer surface 12b to the inner surface 12a. The straight outer peripheral surface 13a extends parallel to the axial direction and faces radially opposite the high-pressure side straight inner peripheral surface 15a. The outer diameter of the straight outer peripheral surface 13a is set slightly smaller than the inner diameter of the high-pressure side straight inner peripheral surface 15a. The tapered outer peripheral surface 13b tapers toward the internal space 2a of the pressure-resistant housing 2. The tapered outer peripheral surface 13b faces radially opposite the tapered inner peripheral surface 15b. The tip surface 13c is perpendicular to the axial direction. The outer peripheral edge of the tip surface 13c is located at the boundary between the tapered inner peripheral surface 15b and the low-pressure-side straight inner peripheral surface 15c of the through hole 15. Therefore, the tip surface 13c is not covered in the axial direction by the end plate main body 12. The cone body 13 is formed with a through hole 16 extending in the axial direction.

[0021] The nut 14 is disposed within the through hole 15 of the end plate body 12. The nut 14 is disposed on the high-pressure side as viewed from the cone body 13. By engaging the nut 14 with a female thread (not shown) formed on the high-pressure-side straight inner peripheral surface 15a of the through hole 15 of the end plate body 12, the tapered outer peripheral surface 13b of the cone body 13 is pressed against the tapered inner peripheral surface 15b of the through hole 15. The nut 14 is formed with a through hole 17 extending in the axial direction.

[0022] As shown in FIG. 4, the feedthrough 4 includes a penetration unit 20, a cup unit 21, and an insulating liquid 22.

[0023] As shown in FIG. 5, the feedthrough unit 20 includes a feed tube 23 and an insulating coating 24. The feed tube 23 is a conductive metal pipe through which the optical fiber F passes, and is made of, for example, beryllium copper (BeCu). The insulating coating 24 is an insulating resin, such as polyethylene or polyurethane, and covers the outer surface of the feed tube 23. The feedthrough unit 20 protrudes from the inner surface 12a of the end plate body 12 toward the internal space 2a. The outer surface 23b of the tip 23a of the feed tube 23 facing the internal space 2a is exposed without being covered by the insulating coating 24. The feedthrough unit 20 penetrates the through hole 15 of the end plate body 12. As shown in FIG. 4, the feedthrough unit 20 is arranged to pass through the through hole 16 of the cone 13 and the through hole 17 of the nut 14. One end of the feedthrough unit 20 is exposed to the internal space 2a of the pressure-resistant housing 2, and the other end is exposed to the external space 2b of the pressure-resistant housing 2.

[0024] As shown in FIGS. 3 and 5, the cup unit 21 includes a cup body 26, a plurality of fixing bolts 27, a plurality of drain bolts 28, a power feed line 29, and an optical fiber protection tube 30.

[0025] The cup body 26 is a specific example of a cup. The cup body 26 is a cylindrical, bottomed body made of insulating resin, including a hollow cylindrical portion 40, a flange 41, and a shaft-facing portion 42.

[0026] 5, the hollow cylindrical portion 40 has a hollow cylindrical shape and extends parallel to the axial direction. The hollow cylindrical portion 40 is disposed so as to face the penetration unit 20 in the radial direction. The hollow cylindrical portion 40 is disposed so as to annularly cover the penetration unit 20. The hollow cylindrical portion 40 is disposed so as to annularly cover the exposed tip 23a of the power feed tube 23.

[0027] The flange 41 projects radially outward in an annular shape from the end of the hollow cylindrical portion 40 on the side of the end face plate 11. The hollow cylindrical portion 40 and the flange 41 are integrally formed.

[0028] The shaft opposing portion 42 is arranged to axially oppose the tip 23a of the power feed pipe 23 of the penetration unit 20 and to close the open end of the hollow cylindrical portion 40. A plurality of filling holes 42a are formed in the shaft opposing portion 42. A drain bolt 28 is attached to each filling hole 42a. The shaft opposing portion 42 is fixed to the hollow cylindrical portion 40 by a plurality of fixing bolts 27. An annular O-ring 43 is provided between the shaft opposing portion 42 and the hollow cylindrical portion 40. This ensures watertightness between the shaft opposing portion 42 and the hollow cylindrical portion 40.

[0029] The cup body 26 is attached to the inner surface 12a of the end plate body 12 with a plurality of fixing bolts 27 that pass through the flange 41. An annular O-ring 44 is provided between the hollow cylindrical portion 40 and the inner surface 12a of the end plate body 12. This ensures watertightness between the hollow cylindrical portion 40 and the inner surface 12a of the end plate body 12.

[0030] The shaft-facing portion 42 faces the end plate main body 12, the conical body 13, and the penetration unit 20 in the axial direction. More specifically, the shaft-facing portion 42 faces the hollow cylindrical portion 40, the inner surface 12a of the end plate main body 12, the tip surface 13c of the conical body 13, and the tip 23a and insulating coating 24 of the power feed tube 23 of the penetration unit 20 in the axial direction. Therefore, the internal space 26a of the cup main body 26 is defined in the axial direction by the shaft-facing portion 42, the inner surface 12a of the end plate main body 12, the tip surface 13c of the conical body 13, and the tip 23a and insulating coating 24 of the power feed tube 23 of the penetration unit 20. The internal space 26a of the cup main body 26 is defined in the radial direction by the hollow cylindrical portion 40.

[0031] The power feeder 29 is composed of a core wire 29a and an insulating coating 29b that covers the core wire 29a. The core wire 29a of the power feeder 29 is connected by brazing to the outer peripheral surface 23b of the tip 23a of the power feed tube 23, which is exposed in the internal space 26a of the cup body 26. The power feeder 29 passes through a power feed outlet hole 40a provided in the hollow cylindrical portion 40 and is drawn out from the internal space 26a of the cup body 26. A self-fusing tape 45 ensures that the power feeder 29 and the hollow cylindrical portion 40 are watertight.

[0032] The optical fiber protection tube 30 protects the optical fiber F drawn out from the optical fiber drawing hole 42 b provided in the axially opposing portion 42 .

[0033] The insulating liquid 22 is filled in the internal space 26a of the cup body 26. The insulating liquid 22 is typically an insulating oil or a fluorine-based inert liquid. The insulating liquid 22 is filled in the internal space 26a of the cup body 26 through one of the filling holes 42a in the shaft opposing portion 42. Alternatively, the insulating liquid 22 may be vacuum degassed using one of the filling holes 42a in the shaft opposing portion 42. By filling the internal space 26a of the cup body 26 with the insulating liquid 22 in this manner, insulation is ensured between the tip 23a of the feed tube 23 exposed in the internal space 26a of the cup body 26 and the inner surface 12a of the end plate body 12.

[0034] In this embodiment, the feedthrough structure E is composed of at least an end plate 11, a feed tube 23, a cup body 26, and an insulating liquid 22.

[0035] Next, a method for manufacturing the feed-through structure E will be described.

[0036] First, the feed pipe 23 of the penetration unit 20 and the cone 13 of the end plate 11 are placed in a mold, and molten resin is injected into the mold to form an insulating coating 24 between the feed pipe 23 and the cone 13. This unitizes the feed unit 20 and the cone 13. Next, the tail cable 5 is connected to the feed unit 20. Next, the feed unit 20 and the cone 13 are inserted into the through hole 15 of the end plate body 12, and the nut 14 is engaged with the high-pressure side straight inner circumferential surface 15a of the through hole 15. This ensures a watertight seal between the cone 13 and the end plate body 12. Next, the hollow cylindrical portion 40 and flange 41 of the cup body 26 are attached to the inner surface 12a of the end plate body 12. Next, the core wire 29a of the feeder cable 29, which was previously placed in the feed outlet hole 40a of the hollow cylindrical portion 40, is brazed to the feed pipe 23 of the feed unit 20. Next, the optical fiber F is drawn out from the optical fiber drawing hole 42b of the axially opposed portion 42, and the axially opposed portion 42 is attached to the hollow cylindrical portion 40. Then, the internal space 26a of the cup body 26 is filled with the insulating liquid 22.

[0037] The second embodiment of the present disclosure has been described above, and the above embodiment has the following features.

[0038] That is, the feed-through structure E includes the end plate 11 of the pressure-resistant housing 2, the power feed pipe 23 penetrating the end plate 11, a cup body 26 (cup) attached to the end plate 11 and covering the power feed pipe 23, and insulating liquid 22 filled in the internal space 26a of the cup body 26. With the above configuration, insulation between the end plate 11 of the pressure-resistant housing 2 and the power feed pipe 23 can be achieved with a small amount of insulating liquid 22.

[0039] The cup body 26 is cylindrical and has a bottom and includes a hollow cylindrical portion 40 that annularly surrounds the power feed pipe 23, and an axially opposed portion 42 that faces the power feed pipe 23 in the axial direction. The power feed pipe 23 and the axially opposed portion 42 face each other in the axial direction, with the insulating liquid 22 sandwiched between them. This configuration ensures insulation between the power feed pipe 23 and the axially opposed portion 42.

[0040] Moreover, the hollow cylindrical portion 40 is provided watertight with respect to the end plate 11. According to the above configuration, watertightness between the hollow cylindrical portion 40 and the end plate 11 is ensured.

[0041] Furthermore, the end plate 11 and the axially opposing portion 42 of the cup body 26 face each other in the axial direction with the insulating liquid 22 sandwiched therebetween. With the above configuration, insulation between the end plate 11 and the axially opposing portion 42 is ensured.

[0042] The feed-through structure E further includes a power supply line 29 connected to the power supply pipe 23. The power supply line 29 passes through the insulating liquid 22 and the cup body 26. According to the above configuration, insulation between the power supply line 29 and the cup body 26 is ensured within the internal space 26a of the cup body 26.

[0043] (Third embodiment) A third embodiment of the present disclosure will be described below with reference to Figures 6 and 7. The following description will focus on differences between this embodiment and the second embodiment, and redundant description will be omitted. In Figures 6 and 7, components corresponding to those already described in the second embodiment are denoted by the same reference numerals. Figure 6 shows a cross-sectional view of feed-through structure E. Figure 7 is an enlarged view of part B in Figure 6.

[0044] 6 and 7, the feedthrough structure E of this embodiment includes an end plate 11 of a pressure-resistant housing 2, similar to the second embodiment. As shown in Fig. 6 and 7, the feedthrough structure E of this embodiment includes a power feed pipe 23 that penetrates the end plate 11, a cup body 26 (cup) that is attached to the end plate 11 and covers the power feed pipe 23, and insulating liquid 22 that is filled in an internal space 26a of the cup body 26. With the above configuration, insulation between the end plate 11 of the pressure-resistant housing 2 and the power feed pipe 23 can be achieved with a small amount of insulating liquid 22.

[0045] 7, in this embodiment, the cup body 26 is a cylindrical, bottomed member made of insulating resin, and includes a hollow cylindrical portion 40 that annularly covers the power feed pipe 23 and an axially opposing portion 42 that axially opposes the power feed pipe 23. The cup body 26 further includes a partition wall 50 that divides the internal space 26a in the axial direction into a first space 26b that is relatively close to the end plate 11 and a second space 26c that is relatively far from the end plate 11. The hollow cylindrical portion 40 includes a first cylindrical portion 40b that radially divides the first space 26b and a second cylindrical portion 40c that radially divides the second space 26c.

[0046] A through hole 50a is formed in the partition wall 50. The power feed pipe 23 is arranged to penetrate the partition wall 50. An O-ring 53 is provided between the power feed pipe 23 and the inner circumferential surface of the through hole 50a. This ensures watertightness between the power feed pipe 23 and the through hole 50a of the partition wall 50.

[0047] The outer peripheral surface 23b of the power feed pipe 23 is exposed in the first space 26b. The outer peripheral surface 23b of the power feed pipe 23 is exposed in the second space 26c.

[0048] The insulating liquid 22 is filled in the first space 26b but not in the second space 26c, thereby ensuring insulation between the outer peripheral surface 23b of the power feed pipe 23 exposed in the first space 26b and the inner surface 12a of the end plate body 12.

[0049] The core wire 29a of the power supply line 29 is connected by brazing to the outer peripheral surface 23b of the tip 23a of the power supply pipe 23 in the second space 26c. The power supply line 29 is drawn out from a power supply drawing hole 40d formed in the second cylindrical portion 40c of the hollow cylindrical portion 40 of the cup body 26.

[0050] In this way, since the power feed line 29 is connected to the power feed pipe 23 within the second space 26c, there is no need to ensure watertightness between the power feed line 29 and the second cylindrical portion 40c of the hollow cylindrical portion 40 at the power feed outlet hole 40d. Similarly, there is no need to ensure watertightness between the optical fiber F and the optical fiber outlet hole 42b of the axially opposing portion 42. Therefore, a complex configuration for ensuring watertightness can be omitted.

[0051] In this embodiment, cup body 26 is configured by axially connecting a first cup portion 51 made of insulating resin and a second cup portion 52 made of insulating resin. First cup portion 51 is cylindrical with a bottom that forms first space 26b and is configured from first cylindrical portion 40b, a partition wall 50, and a flange 41. Second cup portion 52 is cylindrical with a bottom that forms second space 26c and is configured from second cylindrical portion 40c and an axis-facing portion 42.

[0052] The first cup portion 51 is attached to the inner surface 12 a of the end plate body 12 by a plurality of fixing bolts 27 that pass through the flange 41 .

[0053] The second cup portion 52 is connected to the first cup portion 51 by a plurality of fixing bolts 27 .

[0054] Next, a method for manufacturing the feed-through structure E will be described.

[0055] First, the feed pipe 23 of the penetration unit 20 and the cone 13 of the end plate 11 are set in a mold, and molten resin is supplied to the mold to form an insulating coating 24 between the feed pipe 23 and the cone 13. This integrates the penetration unit 20 and the cone 13. Next, the tail cable 5 is connected to the penetration unit 20. Next, the penetration unit 20 and the cone 13 are inserted into the through hole 15 of the end plate body 12, and the nut 14 is engaged with the high-pressure side straight inner circumferential surface 15a of the through hole 15. This ensures a watertight seal between the cone 13 and the end plate body 12 in an annular manner. Up to this point, the process is the same as the second embodiment.

[0056] Next, the first cup portion 51 is attached to the inner surface 12a of the end plate main body 12 using multiple fixing bolts 27. At this time, the power feed pipe 23 passes through the through hole 50a of the partition wall 50 of the first cup portion 51. Next, the insulating liquid 22 is filled into the first space 26b through a filling hole provided in the partition wall 50. Next, the core wire 29a of the power feed line 29 is brazed to the power feed pipe 23 of the penetration unit 20, and the power feed line 29 is pulled out from the power feed pull-out hole 40d of the hollow cylindrical portion 40, and the optical fiber F is pulled out from the optical fiber pull-out hole 42b of the axially opposing portion 42. In this state, the second cup portion 52 is attached to the first cup portion 51 using multiple fixing bolts 27.

[0057] The third embodiment has been described above, and the above embodiment has the following features.

[0058] That is, the cup body 26 (cup) is a bottomed cylinder having a hollow cylindrical portion 40 that annularly surrounds the power feed tube 23 and an axially opposing portion 42 that faces the power feed tube 23 in the axial direction. The cup body 26 further has a partition wall 50 that divides the internal space 26a into a first space 26b and a second space 26c in the axial direction. The power feed tube 23 is disposed so as to penetrate the partition wall 50. The power feed tube 23 is exposed in both the first space 26b and the second space 26c. The insulating liquid 22 is filled in the first space 26b but not in the second space 26c. With the above configuration, insulation between the end plate 11 of the pressure-resistant housing 2 and the power feed tube 23 can be achieved with even less insulating liquid 22.

[0059] Moreover, the hollow cylindrical portion 40 is provided watertight with respect to the end plate 11. According to the above configuration, watertightness between the hollow cylindrical portion 40 and the end plate 11 is ensured.

[0060] Furthermore, the end plate 11 and the partition wall 50 face each other in the axial direction with the insulating liquid 22 sandwiched therebetween. With the above-described configuration, insulation between the end plate 11 and the partition wall 50 is ensured.

[0061] The feed-through structure E further includes a power feed line 29 connected to the power feed pipe 23 in the second space 26c. The power feed line 29 passes through the cup body 26. With the above configuration, a complicated configuration for ensuring watertightness between the cup body 26 and the power feed line 29 can be avoided.

[0062] Cup body 26 is configured by axially connecting bottomed cylindrical first cup portion 51 that forms first space 26b and bottomed cylindrical second cup portion 52 that forms second space 26c. With the above configuration, core wire 29a of power feeder line 29 can be connected to outer circumferential surface 23b of tip 23a of power feeder tube 23 after first space 26b is filled with insulating liquid 22, thereby improving assembly workability.

[0063] Although the embodiments of the present disclosure have been described above, the above embodiments can be modified as follows.

[0064] In each of the above embodiments, the feedthrough structure E is applied to the submarine optical repeater 1. However, instead of this, the feedthrough structure E can also be applied to an optical submarine repeater installed on the bottom of a lake. [Industrial Applicability]

[0065] The present disclosure can be applied to electronic devices in general that are installed on the bottom of the sea or lake. [Explanation of symbols]

[0066] 1 Optical submarine repeater 2 Pressure-resistant housing 2a Interior space 2b External space 3 Internal Unit 4 Feedthrough 5 tail cable 10 Pressure-resistant housing 10a Open end 11 End plate 12 End plate body 12a Inner surface 12b External surface 13 Cone 13a Straight outer surface 13b Tapered outer surface 13c Tip surface 14 Nut 15 through holes 15a High pressure side straight inner surface 15b Tapered inner surface 15c Low pressure side straight inner surface 16 through holes 17 Through hole 20 Penetration Unit 21 Cup unit 22 Insulating liquid 23 Feed tube 23a tip 23b Outer surface 24 Insulation coating 26 Cup body 26a Interior space 26b 1st space 26c 2nd space 27 Fixing bolt 28 Drain bolt 29 Power line 29a core wire 29b Insulation coating 30 Optical fiber protection tube 40 hollow cylindrical section 40a Power supply outlet hole 40b First cylindrical part 40c Second cylindrical part 40d Power supply outlet hole 41 flange 42 Shaft opposing part 42a Filling hole 42b Optical fiber extraction hole 43 O-ring 44 O-ring 45 Self-adhesive tape 50 Bulkhead 50a through hole 51 First Cup Section 52 Second Cup Section 53 O-ring E Feed-through structure F Optical Fiber

Claims

1. An end plate of a pressure-resistant housing; a feeder tube passing through the end plate; a cup attached to the end plate and covering the feed tube; an insulating liquid filled in the internal space of the cup; Equipped with the cup is a bottomed cylindrical cup including a hollow cylindrical portion that annularly covers the power feed pipe and an axially opposing portion that faces the power feed pipe in the axial direction, the cup further has a partition wall that divides the internal space into a first space that is relatively close to the end plate and a second space that is relatively far from the end plate in the axial direction, the power supply pipe is disposed to penetrate the partition wall and is exposed in the first space and the second space, The insulating liquid is filled in the first space and not in the second space. Feed-through structure.

2. The hollow cylindrical portion is provided watertightly with respect to the end plate. The feedthrough structure of claim 1 .

3. the end plate and the partition wall face each other in the axial direction with the insulating liquid sandwiched therebetween; The feed-through structure according to claim 1 or 2.

4. a power supply line connected to the power supply pipe in the second space; The power supply line passes through the cup.

4. A feed-through structure according to claim 1.

5. The cup is configured by connecting a first cup portion having a bottomed cylindrical shape that forms the first space and a second cup portion having a bottomed cylindrical shape that forms the second space in the axial direction.

5. A feed-through structure according to any one of claims 1 to 4.

Images