KR100929540B1 - Feed line for high frequency current - Google Patents

Abstract

A feeder for high frequency current is comprised of a conductor and an insulating sheath covering the conductor. The conductor is formed as a unitary structure in which at least one gap is spaced apart from the other part and forms at least one gap therebetween in a cross section perpendicular to the longitudinal direction thereof. An insulation sheath is a molded object of synthetic resin, and a conductor is integrally molded in an insulation sheath.

Feeder, conductor, high frequency current, insulation, current loss, manufacturability

Description

Feed line for high frequency current {HIGH FREQUENCY CURRENT FEEDING CONDUCTOR}

The present invention relates to a feeder line for flowing a high frequency current.

Japanese Patent Laid-Open No. 5-190026 discloses a feeder line in which a plurality of ring conductors are arranged concentrically through an insulating layer. In general, in a feeder line through which a high frequency current flows, when the frequency of the current increases, a skin effect occurs, and an alternating current tends to flow only near the surface of the conductor, resulting in an increase in lead resistance and a significant loss. Will increase. Generally, the skin depth d which shows the degree of surface effect is shown by the following.

Epidermal Depth: d = (2 / ωσμ) ^1/2

ω: frequency, σ: conductivity of the material, μ: magnetic permeability of the material

That is, if the thickness of the feed line is less than or equal to the skin depth d determined by the frequency, the current loss due to the surface effect can be reduced. Therefore, in the above-mentioned conventional feeder, the current loss is suppressed by setting the thickness of each ring conductor to 1 micron.

However, since the feeder of such a structure needs to repeat the process which coat | covers an insulating layer on the surface of a ring conductor many times, manufacturing time becomes long and there exists a problem of difficult positioning of a ring conductor.

This invention is made | formed in view of the point mentioned above, The objective is to provide the feeder wire for the high frequency current which can aim at the reduction of the loss of a high frequency current, and also improves the manufacturability.

The feeder according to the present invention is composed of a conductor and an insulating sheath covering the conductor. The conductor is formed as a single structure in which a portion of the conductor is spaced apart from other portions at predetermined intervals in at least one direction crossing the cross section, in a cross section perpendicular to the longitudinal direction thereof. An insulation sheath is a molded object of synthetic resin, and the said conductor is integrally molded in the said insulation sheath. Therefore, the conductor is divided along the direction perpendicular to the direction of the magnetic flux generated by the current flowing through the conductor, so that the loss of current due to the surface effect can be reduced. By integrally molding, manufacturability can be improved.

In the conductor, it is preferable that a closed space appearing in the cross section is formed so that a part of the conductor is spaced apart from other portions by the closed space. In this case, the closed space is not filled with the insulating resin, and the closed space can be used as a space into which the feed member connecting member is inserted.

Further, it is preferable that the conductor has an inner tube and an outer tube, and the inner tube and the outer tube are joined only at one place on the circumference of each other. By constituting the conductor with the inner tube and the outer tube, it is possible to improve the strength of the entire conductor while forming each tube thinly. In addition, since the inner tube and the outer tube are spaced along the radial direction almost over the entire circumference of the conductor, the thickness of the conductor can be made thin in the direction orthogonal to the direction of the magnetic flux generated by the current flowing through the conductor. The loss can be minimized.

Moreover, it is preferable that the said outer side pipe is comprised by the arc-shaped part and flat part which the outline protrudes outward in the said cross section. This flat part can be used as a contact surface with the connection member used for connection of a feeder, and the stable electrical connection with a connection member is attained.

Moreover, it is preferable that the said outer side pipe | tube is comprised from the said cross section by a pair of left and right flat parts opposing each other in the radial direction, and an arc-shaped part which protrudes out of a pair of upper and lower sides. In this case, two flat parts can be made into the contact surface with the connection member of a feed line, and connection of feed lines can be reliably performed using the connection member of the shape which affixes and attaches two flat parts.

The conductor is preferably formed by bending one sheet of metal. Thereby, since the thickness in each part of a conductor can be made thin, current loss can be suppressed and a predetermined cross-sectional shape can be made easy.

Moreover, it is also preferable to divide the cross-sectional shape of said conductor in the radial direction at predetermined intervals in the whole circumference. In this case, a plurality of thin conductors can be arranged in the radial direction, and a large current capacity can be ensured by increasing the cross-sectional area of the conductors while reducing the current loss.

1 is a perspective view showing a feed line according to a first embodiment of the present invention.

2 is a side view of a feeder according to the first embodiment.

3 is a perspective view illustrating a connection port between a feeder line and a feeder line according to the first embodiment.

4 is a cross-sectional view illustrating a connection state of a power supply line according to the first embodiment.

5 is a perspective view illustrating a feeder according to a second exemplary embodiment of the present invention.

6 is a front view illustrating a connection state of a power supply line according to the second embodiment.

7 is a cross-sectional view illustrating a connection state of a power supply line according to the second embodiment.

8 is a perspective view showing a modification of the feeder according to the second embodiment.

9 is a cross-sectional view illustrating a connection state of a power supply line according to the second embodiment.

10 is a perspective view illustrating a feeder line and a connector according to a third exemplary embodiment of the present invention.

11 is a front view illustrating a connection state of a power supply line according to the third embodiment.

12 is a cross-sectional view illustrating a connection state of a power supply line according to the third embodiment.

13 is a perspective view showing a first modification of the feeder according to the third embodiment.

14 is a cross-sectional view illustrating a connection state of a power supply line according to the third embodiment.

15 is a perspective view showing a second modification of the feeder according to the third embodiment.

16 is a cross-sectional view showing a third modification of the feeder according to the third embodiment.

17 is a perspective view illustrating a feeder according to a fourth exemplary embodiment of the present invention.

18 is a sectional view of a conductor used in the feeder according to the fourth embodiment.

19 is a cross-sectional view showing a first modification of the conductor according to the fourth embodiment.

20 is a sectional view showing a second modification of the conductor according to the fourth embodiment.

21 is a perspective view of a feeder according to a fifth exemplary embodiment of the present invention.

22 is a perspective view showing a connection state of a power supply line according to the fifth embodiment.

23 is a cross-sectional view illustrating a power supply line according to the fifth embodiment.

24 is a perspective view illustrating a power supply line according to a sixth embodiment of the present invention.

25 is a sectional view of a feeder according to the sixth embodiment.

Fig. 26 is a sectional view showing a first modification of the feeder according to the sixth embodiment.

27 is a perspective view showing a second modification of the feeder according to the sixth embodiment.

28 is a cross-sectional view illustrating a power supply line according to the sixth embodiment.

29 is a cross-sectional view showing a third modification of the feeder according to the sixth embodiment.

30 is a perspective view showing a fourth modification of the feeder according to the sixth embodiment.

31 is a cross-sectional view illustrating a power supply line according to the sixth embodiment.

(First embodiment)

The feed line for the high frequency current which concerns on 1st Example of this invention is demonstrated based on FIG. The feeder is composed of an insulating sheath 10 which is an insulating resin molded body and a conductor 20 which is integrally molded by an insert, for example. The conductor 20 includes a circular inner tube 21 and a circular outer tube 26 formed by bending a sheet of metal. The inner tube 21 and the outer tube 26 are located on the same axis and joined by coupling pieces 28 extending radially only in one place on the periphery of each other, so that the conductor 20 of a single structure can be obtained. have. The insulating sheath 10 covers the entire circumference of the outer tube 26, and the space between the inner tube 21 and the gap between the inner tube 21 and the outer tube 26 becomes a closed space in cross section and is insulated. It remains as a space where resin is not filled. As for the metal plate which forms the conductor 20, for example, a copper plate having a thickness of 0.5 to 0.8 mm is used, and end portions are welded to each other at one place on the outer circumference of the outer tube 26 to form the outer tube 26. Inner and inner tubes 21 are isolated from the insulating sheath 10.

Thus, in the insulating sheath 10, the inner side pipe | tube 21 and the outer side pipe | tube 26 are spaced apart radially except the site | part of the engagement piece 28, and form a gap therebetween. Therefore, the conductor is divided along the direction orthogonal to the direction of the magnetic flux (indicated by the arrow in FIG. 2) generated by the current flowing through the conductor over almost the entire circumference of the conductor 20, and the cross-sectional area of the conductor 20 as a whole. While satisfying the predetermined current capacity, the current loss peculiar to the high frequency due to the surface effect and the proximity effect can be reduced. In addition, since the conductor 20 is a single structure, positioning in the insulating sheath 10 is easy, and manufacture of a feeder becomes easy.

3 and 4 show a connection structure between feeders using the connector 30. The connection port 30 is composed of an insulating base table 32 having both sides of a socket 34 into which an end of a feed line is inserted, and a plug 36 protruding into each of the sockets 34. The feed line can be connected by making the plug 36 press-contact with the inner peripheral surface of the outer pipe 26. Each plug 36 is formed of a pair of connecting pieces having an arc shape in cross section, the thickness of which is sufficiently smaller than the gap thickness, and leaves a sufficient distance between the inner pipe 21 and the inner pipe 21. Therefore, although the feed line is connected using the space between the inner side pipe | tube 21 and the outer side pipe | tube 26, a loss of an electric current can also be reduced also in the connection part of a feed line. Preferably, the thickness of the conductor 20 is 0.5 to 0.8 mm, the inner diameter of the outer tube 26 is 5 to 10 mm, and the outer diameter of the inner tube 21 is 4 to 6 mm. In such a connection system, it is not necessary to peel off the insulation sheath 10 of the edge part of a feeder line, and it can connect simply by inserting the edge part of an electric wire into the socket 34 of a connection port.

(2nd Example)

5 to 7 show a feeder according to a second embodiment of the present invention. The feeder line of this embodiment is basically the same structure as 1st Example, and the point which formed one side surface of the outer side pipe 26 by the flat part 29 differs. Therefore, the same members are denoted by the same reference numerals. As shown in Figs. 6 and 7, the connection port 30A for connecting the feeder is configured by arranging a connection spring 36A having a U-shaped cross section in the socket 34A formed on the insulating base 32A. do. The connection spring 36A is fixed to the base stand 32A on the bottom side, and is elastically deformable in the direction in which the two side pieces 37 widen each other, and is exposed to the end of each feeder line inserted into the socket 34A. By pressing the both sides of the pipe 26, the feeder is connected. An arc pressurization port 38 along the curved surface of the outer tube 26 is formed in one corner piece 37, and a flat pressurization port 39 conforming to the flat portion 29 of the outer tube 26 in the other corner piece. Is formed and is electrically connected reliably by the pressure welding of the flat parts.

8 and 9 show one modified example of the present embodiment, and both upper and lower surfaces of the outer tube 26 are formed in an arc shape, and flat portions 29 are formed on both left and right sides thereof. In this case, the flat pressing port 39 is formed in each side piece 37 of the connection spring 36A used for the connection port 30A, respectively, and it electrically connects with a feeder line more reliably.

(Third Embodiment)

10 to 12 show a feeder according to a third embodiment of the present invention. The feeder of the present embodiment has the same configuration as the first embodiment, and differs in that the bottom surface of the outer tube 26 is formed by the flat portion 29. Therefore, the same members are denoted by the same reference numerals. The connection port 30B for connecting the feed line is configured to accommodate the connecting conductor 36B and the pressure spring 35 in the insulating base stand 32B having a U-shaped cross section, and is inserted into the insulating base stand 32B. The connection conductor 36B press-contacts the flat part 29 of the bottom face of the outer side pipe 26 of each feeder line, and connects a feeder line. Both side pieces 31 of the base stand 32B are elastically deformable, and the curved surface of the outer tube 26 outer periphery is accommodated in the arc-shaped catch holder 33 formed in the upper end of the both sides piece 31. As a result, the outer tube 26, that is, the feed line is held and supported at a predetermined position in the connector 30B, and in this state, the pressure spring 35 causes the connecting conductor 36B to flatten the bottom of the outer tube 26 ( 29). Also in this embodiment, since electrical connection is performed in the flat part 29, connection of feed lines can be performed stably.

In each of the above-described embodiments, an example in which the cross-sectional shape of the conductor is determined by bending the metal plate is shown, but the present invention is not necessarily limited to these examples, and FIGS. 13, 14, 15, and FIG. As shown in each modification of 16, the conductor 20 whose cross-sectional shape is determined by the extrusion of metal can also be used.

(Example 4)

17 and 18 show a power supply line according to a fourth embodiment of the present invention. The feeder of the present embodiment is configured by inserting the spiral conductor 20 into the insulating sheath 10. The conductor 20 is a spiral wound of a sheet of metal, and a plurality of gaps are arranged in a radial direction, that is, a direction orthogonal to the direction of magnetic flux generated by a current flowing through the conductor (indicated by arrows in the drawing), The conductors are segmented in the radial direction over the entire circumference of the feeder. The gap is filled with a resin forming the insulating sheath 10, the cross-sectional shape of the conductor is maintained, and deformation of the conductor is prevented.

19 shows a first modification of the present embodiment, and the conductors 20 become a rectangular spiral.

20 shows a second modified example of the present embodiment, wherein the conductors 20 are the inner tube 21 of the C-shaped cross section, the intermediate tube 24 of the circular cross section, and the outer tube 26 of the C-shaped cross section. It is composed. These tubes are arranged on the same axis, and the inner tube 21 and the intermediate tube 24 are joined to the coupling piece 23 only in one place on the periphery of each other, and the intermediate tube 24 and the outer tube 26 are The coupling pieces 25 are coupled only at one place on the periphery of each other. These engaging pieces 23 and 25 are arrange | positioned in alignment with the opening part 22 of the inner side pipe | tube 21, and the opening part 27 of the outer side pipe | tube 26 along the diameter in the cross section of the conductor 20. The conductor is divided at predetermined intervals along the radial direction throughout its circumference.

(Example 5)

21 to 23 show a power supply line according to a fifth embodiment of the present invention. This feeder is comprised by inserting the conductor 120 of the E-shaped cross section formed by the extrusion of metal into the insulating sheath 110. As shown in FIG. The conductor 120 is comprised from the horizontal piece 121, the outer longitudinal piece 122 extended from the both ends of a horizontal piece, and the central longitudinal piece 123 extended from the center of the horizontal piece 121, The outer longitudinal piece 122 and the center The length of the longitudinal piece 123 is longer than the horizontal piece 121, and the gap is formed between the center longitudinal piece 123 and the outer longitudinal piece 122. As shown in FIG. The thickness of the central longitudinal piece 123 is larger than the horizontal piece 121 and the outer longitudinal piece 122. The gap is filled with the resin of the insulating sheath 110, so that the distance between the central longitudinal piece 123 and the outer longitudinal piece 122 is kept constant.

The connection port 130 for connecting the feed line is composed of an insulating base stand 32 having a socket 134 and a connection conductor 136 fixed to the bottom of the socket 134 and inserted into the socket 134. When the flat surface of the bottom face of the horizontal piece 121 of the conductor 120 of each feed line is pressed against the connection conductor 136, the feed line is connected.

(Example 6)

24 and 25 show a power supply line according to a sixth embodiment of the present invention. This feeder is constructed by inserting the conductor 220 formed by the extrusion of metal into the insulating sheath 210. The conductor 220 includes a plurality of central longitudinal pieces 223 protruding from the horizontal piece 221, the outer longitudinal piece 222 extending from both ends of the horizontal piece 221, and the horizontal piece 221 between the both outer longitudinal pieces 222. It is composed of These longitudinal pieces 222 and 223 are arranged in parallel with each other at predetermined intervals, and in the cross section of the feed line, the conductor 220 is divided by predetermined intervals along the horizontal direction. Therefore, in the direction of the magnetic flux generated by the current flowing through the conductor, the conductor 220 is divided along the direction orthogonal to the direction indicated by the arrow in Fig. 25, thereby reducing the current loss. Two central longitudinal pieces 223 adjacent to each other are joined by a joining piece 224 to form a closed space 225 in the cross section of the conductor therebetween, and the closed space 225 has an insulating sheath 210. ) Is not filled. The other part is filled with resin, and the space | interval between longitudinal pieces is maintained.

Fig. 26 shows a first modification of the present embodiment. Here, the conductor 220A of rectangular cross section is used, and the closed space 225A divided into the some longitudinal piece 222A is formed in the inside of conductor 220A. The insulating sheath 210A surrounds only the outer circumference of the conductor 220A.

27 and 28 show a second modified example of the present embodiment. The conductor 220B used herein is extruded into a shape in which the plurality of longitudinal pieces 222B extend parallel to each other at equal intervals from the horizontal piece 221B, so that in the insulating sheath 210B, each of the conductors 220B is along the width direction of the feed line. The longitudinal pieces 222B are arranged at predetermined intervals to divide the conductor 220B in the width direction of the feed line.

29 shows a third modification of the present embodiment. The conductor 220C used herein is extruded into a cross-sectional shape in which the center of the pair of longitudinal pieces 222C is coupled to the horizontal piece 221C, and the plurality of parallel inner longitudinal pieces 223C extend upward and downward from the horizontal piece 221C. In the insulating sheath 210C, each longitudinal piece is arranged in the insulating sheath 210C with the gap interposed therebetween, thereby separating the conductor 220C in the width direction of the feed line.

30 shows a fourth modification of the present embodiment. The conductor 220D used here bends a piece of metal plate, and protrudes the plurality of longitudinal pieces 222D from each other in parallel with each other in the insulating sheath 210D along the width direction of the feed line in the insulating sheath 210D. The longitudinal pieces of are arranged at predetermined intervals to divide the conductor 220D in the width direction of the feed line.

According to the present invention, it is possible to provide a feed line for a high frequency current in which the loss of a high frequency current can be reduced while also improving the manufacturability.

Claims (8)

As a high-frequency electric current feeder covering a conductor with an insulating sheath, The conductor is formed as a single structure in which a portion of the conductor is spaced at predetermined intervals in at least one direction crossing the cross section with another portion in a cross section perpendicular to the longitudinal direction of the conductor, The insulation sheath is a molded body of synthetic resin, the conductor is integrally molded into the insulation sheath, And said conductor is provided with an inner tube and an outer tube, and said inner tube and said outer tube are coupled to each other. The method of claim 1, The conductor forms a closed space appearing in the cross section, and a portion of the conductor is spaced apart from another portion by the closed space. The method of claim 1, The said outer side pipe | tube is a feed line for the high frequency electric current of the said cross section, Comprising: The arc part and flat part which the outline protrudes outward are characterized by. The method of claim 1, The said outer side pipe | tube is a feed line for the high frequency electric current characterized by the said cross section consisting of a pair of left and right flat parts opposing each other in the radial direction, and a pair of upper and lower arcs protruding outward. The method according to any one of claims 1 to 4, And said conductor is formed by bending one sheet of metal plate. The method according to any one of claims 1 to 3, In the cross section, a part of the outline of the conductor is a flat portion, the feed line for high frequency current. The method of claim 1, The said conductor is the said power supply line for the high frequency electric current cut | disconnected in the radial direction at predetermined intervals over the whole circumference in the said cross section. delete

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