Static Sensing Equipment

Abstract

A static induction device, wherein a plurality of horizontal flow paths include a first horizontal flow path (D11) and a second horizontal flow path (D12) having a height higher than the first horizontal flow path (D11). The second horizontal flow path (D12) is located at a boundary between a first winding section (122a) and a second winding section (122b), and is continuous with a second vertical flow path (D22).

Description

Technical Field

[0001] The present disclosure relates to a static sensing device. Background Art

[0002] As an existing document that discloses the structure of an oil-filled static induction device, there is Japanese Patent Publication No. 2014-7298. The oil-filled static induction device described in Japanese Patent Publication No. 2014-7298 includes a multi-layer disc winding, an inner circumferential insulating cylinder, an outer circumferential insulating cylinder, and a spacer ring. The multi-layer disc winding forms a horizontal flow path of insulating oil along the axial direction and between each layer. The inner circumferential insulating cylinder is coaxially arranged on the inner circumferential side of the multi-layer disc winding, and a vertical flow path of insulating oil is formed between the innermost circumferential winding and the wall surface of the cylinder. The outer circumferential insulating cylinder is coaxially arranged on the outer circumferential side of the multi-layer disc winding, and a vertical flow path of insulating oil is formed between the outermost circumferential winding and the wall surface of the cylinder. The spacer ring is arranged between the winding on at least one of the innermost circumferential side and the outermost circumferential side of the disc winding and the winding adjacent to the winding. In the spacer ring, the spacer pieces that ensure the insulation of the vertical flow path of insulating oil between the windings are dispersed along the circumferential direction of the annular shield conductor.

[0003] The static induction device described in Japanese Patent Laying-Open No. 2014-7298 has room for improving the cooling efficiency of the refrigerant. Summary of the invention

[0004] The present disclosure is completed in view of the above technical problems, and its object is to provide a static induction device that can improve the cooling efficiency of the refrigerant.

[0005] The static induction device based on the present disclosure includes an iron core, a first cylindrical winding, a second cylindrical winding, an insulating cylinder and an insulating barrier. The first cylindrical winding is wound on the iron core. The second cylindrical winding is wound on the iron core and is located outside the first cylindrical winding. The insulating cylinder is arranged between the first cylindrical winding and the second cylindrical winding. The insulating barrier is arranged on the outer peripheral side of the insulating cylinder. A first vertical flow path extending in a vertical direction for the flow of refrigerant is formed between the insulating cylinder and the second cylindrical winding. A plurality of horizontal flow paths are formed in the second cylindrical winding, and the plurality of horizontal flow paths are arranged at intervals in the vertical direction, continuous with the first vertical flow path and extending in the horizontal direction for the flow of refrigerant. The second cylindrical winding includes a first winding section and a second winding section. Only a plurality of horizontal flow paths are formed in the first winding section. The second winding section is arranged at intervals in the vertical direction from the first winding section. A plurality of horizontal flow paths and a second vertical flow path extending in the vertical direction for the flow of refrigerant are each formed in the second winding section. The insulating barrier covers the upper surface and inner circumference of the second winding section. The plurality of horizontal flow paths include a first horizontal flow path and a second horizontal flow path higher than the first horizontal flow path. The second horizontal flow path is located at the boundary between the first winding section and the second winding section and is continuous with the second vertical flow path.

[0006] The foregoing and other objects, features, aspects and advantages of the present disclosure will become more apparent from the following detailed description of the present disclosure when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a perspective view showing the structure of a static induction device according to one embodiment.

[0008] Figure 2 Yes Figure 1 An enlarged partial cross-sectional view of Part II.

[0009] Figure 3 It is a partial cross-sectional view showing a refrigerant flow path provided around the second cylindrical winding.

[0010] Figure 4 is from Figure 3 A partial cross-sectional view observed in the direction of the arrow on line IV-IV.

[0011] Figure 5 is from Figure 3 A partial cross-sectional view observed in the direction of the V-V line arrow.

[0012] Figure 6 1 is a partial cross-sectional view of a second insulating spacer showing a modified example. DETAILED DESCRIPTION

[0013] Hereinafter, a static induction device according to an embodiment will be described with reference to the accompanying drawings. In the following description of the embodiment, the same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated. In addition, in the following embodiment, a core type transformer (Japanese: inner iron type transformer) is illustrated as the static induction device, but the static induction device is not limited to the core type transformer, and includes, for example, a reactor and the like.

[0014] Figure 1 is a perspective view showing the structure of a static induction device according to an embodiment. In Figure 1 In order to explain the structure of the winding, one of the three windings is segmented and cut and illustrated. Figure 2 is Figure 1 An enlarged partial cross-sectional view of part II of

[0015] As Figure 1 and Figure 2 shown, a static induction device 100 according to an embodiment includes an iron core 110, a first cylindrical winding 121, a second cylindrical winding 122, an insulating cylinder, and an insulating barrier 127. The static induction device 100 of the present embodiment is a so-called core type transformer.

[0016] The iron core 110 is formed by laminating a plurality of silicon steel sheets. Since the static induction device 100 of the present embodiment is a three-phase transformer, the iron core 110 has three legs. A cylindrical winding centered on the leg is disposed on each leg of the iron core 110.

[0017] The first cylindrical winding 121 is wound around the leg of the iron core 110. The second cylindrical winding 122 is wound around the leg of the iron core 110 and is located outside the first cylindrical winding 121. In each of the first cylindrical winding 121 and the second cylindrical winding 122, the covered conductor is wound in a circular plate shape or a spiral shape.

[0018] A first insulating cylinder 123 formed of an insulating material such as a pressed plate or epoxy resin is disposed between the leg of the iron core 110 and the first cylindrical winding 121. A second insulating cylinder 124 formed of an insulating material such as a pressed plate or epoxy resin is disposed between the first cylindrical winding 121 and the second cylindrical winding 122. A third insulating cylinder 125 formed of an insulating material such as a pressed plate or epoxy resin is disposed outside the second cylindrical winding 122.

[0019] Between the first cylindrical winding 121 and the first insulating cylinder 123, a plurality of prismatic first spacers 131 having electrical insulation are arranged at equal intervals in the circumferential direction of the first insulating cylinder 123.

[0020] The first spacer 131 is sandwiched between the first cylindrical winding 121 and the first insulating tube 123, and a gap is ensured between the first cylindrical winding 121 and the first insulating tube 123 by the first spacer 131. In the present embodiment, the first spacer 131 is formed of an insulating material such as epoxy resin.

[0021] Between the first cylindrical winding 121 and the second insulating cylinder 124 , a plurality of second spacers 132 having a quadrangular prism shape and having electrical insulation are arranged at equal intervals in the circumferential direction of the first cylindrical winding 121 .

[0022] The second spacer 132 is sandwiched between the first cylindrical winding 121 and the second insulating cylinder 124, and a gap is ensured between the first cylindrical winding 121 and the second insulating cylinder 124 by the second spacer 132. In the present embodiment, the second spacer 132 is formed of an insulating material such as epoxy resin.

[0023] Between the second cylindrical winding 122 and the second insulating tube 124 , a plurality of third spacers 133 having a quadrangular prism shape and having electrical insulation are arranged at equal intervals in the circumferential direction of the second insulating tube 124 .

[0024] The third spacer 133 is sandwiched between the second cylindrical winding 122 and the second insulating tube 124, and a gap is ensured between the second cylindrical winding 122 and the second insulating tube 124 by the third spacer 133. In the present embodiment, the third spacer 133 is formed of an insulating material such as epoxy resin.

[0025] An annular pressing plate 126 is disposed so as to face both ends in the vertical direction of the second cylindrical winding 122. An electrostatic shield (not shown) is disposed between the pressing plate 126 and the second cylindrical winding 122.

[0026] The insulation barrier 127 is disposed on the outer circumference of the second insulation tube 124. The insulation barrier 127 is formed of an angle plate. Figure 2 The high electric field portion HV of the second cylindrical winding 122 is shown covered.

[0027] In this embodiment, static induction device 100 includes insulating oil as a refrigerant. In addition, the refrigerant is not limited to insulating oil, and may also be insulating gas. The refrigerant circulates inside static induction device 100 by natural convection.

[0028] Figure 3 FIG. 2 is a partial cross-sectional view showing the refrigerant flow path provided around the second cylindrical winding. Figure 3 In the figure, arrows are used to indicate the refrigerant flow caused by natural convection. Figure 2 and Figure 3As shown, a first vertical flow path D21 extending in a vertical direction for the flow of refrigerant is formed between the second insulating cylinder 124 and the second cylindrical winding 122 . The first vertical flow path D21 is ensured by the third spacer 133 .

[0029] A plurality of horizontal flow paths are formed in the second cylindrical winding 122. The plurality of horizontal flow paths are arranged at intervals in the vertical direction, are continuous with the first vertical flow path D21, and extend in the horizontal direction for the refrigerant to flow. The plurality of horizontal flow paths include a plurality of first horizontal flow paths D11 and a second horizontal flow path D12. The height H2 of the second horizontal flow path D12 is higher than the height H1 of each of the plurality of first horizontal flow paths D11.

[0030] The second cylindrical winding 122 includes a first winding section 122a and a second winding section 122b. Only a plurality of first horizontal flow paths D11 are formed in the first winding section 122a. A plurality of first horizontal flow paths D11 and a second vertical flow path D22 extending in a vertical direction for refrigerant flow are each formed in the second winding section 122b.

[0031] The second winding section 122b is arranged at a distance from the first winding section 122a in the vertical direction. The second horizontal flow path D12 is located at the boundary between the first winding section 122a and the second winding section 122b, and is continuous with the second vertical flow path D22.

[0032] The insulating barrier 127 covers the upper surface and the inner circumference of the second winding section 122b. The portion of the insulating barrier 127 extending in the vertical direction is located between the second insulating cylinder 124 and the second cylindrical winding 122. The portion of the insulating barrier 127 extending in the horizontal direction is located between the electrostatic shield and the second cylindrical winding 122. The insulating barrier 127 can improve the insulation resistance between the first cylindrical winding 121 and the second cylindrical winding 122.

[0033] The width of the portion of the first vertical flow path D21 where the insulating barrier 127 is not arranged is W1. The width of the first vertical flow path D21a between the insulating barrier 127 and the second winding section 122b in the portion of the first vertical flow path D21 where the insulating barrier 127 is arranged is W1a. The width W1a of the first vertical flow path D21a is smaller than the width W1 of the first vertical flow path D21. The first vertical flow path D21a is ensured by a spacer (not shown) having electrical insulation sandwiched between the insulating barrier 127 and the second winding section 122b.

[0034] Figure 4 is from Figure 3 A partial cross-sectional view of the IV-IV line arrow direction. Figure 4As shown, the first horizontal flow path D11 is ensured in each of the first winding section 122a and the second winding section 122b by a plurality of first insulating spacers 140 arranged at intervals from each other in the circumferential direction.

[0035] The first insulating spacer 140 has a substantially rectangular parallelepiped shape. The first insulating spacer 140 is formed of an insulating material such as epoxy resin. The first insulating spacer 140 is engaged with each of the third spacer 133 and the fourth spacer 134. Specifically, two recesses are formed in the first insulating spacer 140 to engage with the third spacer 133 and the fourth spacer 134, respectively.

[0036] The fourth spacer 134 has a quadrangular column shape and is sandwiched between the second cylindrical winding 122 and the third insulating cylinder 125. A plurality of fourth spacers 134 are arranged at equal intervals in the circumferential direction of the second cylindrical winding 122. The fourth spacer 134 is formed of an insulating material such as epoxy resin.

[0037] The second vertical flow path D22 is ensured by disposing an electrically insulating spacer (not shown) between the turns of the second winding section 122b. The width of the second vertical flow path D22 is W2. The width W2 of the second vertical flow path D22 is greater than the width W1a of the first vertical flow path D21a.

[0038] Figure 5 is from Figure 3 The cross-sectional view observed in the direction of the arrow on the V-V line. Figure 5 As shown, the static induction device 100 further includes a plurality of second insulating spacers 150 , and the plurality of second insulating spacers 150 are sandwiched between the first winding section 122 a and the second winding section 122 b to ensure the second horizontal flow path D12 .

[0039] The thickness of the second insulating spacer 150 is greater than the thickness of the first insulating spacer 140. Thus, the height H2 of the second horizontal flow path D12 is greater than the height H1 of each of the plurality of first horizontal flow paths D11.

[0040] When viewed from the vertical direction, each of the plurality of second insulating spacers 150 has a fan-shaped shape in which the circumferential length of the second cylindrical winding 122 increases from the inner circumference side to the outer circumference side of the second cylindrical winding 122. Thus, Figure 5 The width L2 of the outer peripheral end of the second horizontal flow path D12 is larger than Figure 4 The width L1 of the outer peripheral end of the first horizontal flow path D11 shown is small. The second insulating spacer 150 is formed with two recessed portions that engage with the third spacer 133 and the fourth spacer 134 , respectively.

[0041] In the static induction device 100 of the present embodiment, the second horizontal flow path D12 having a height H2 higher than the height H1 of each of the plurality of first horizontal flow paths D11 is located at the boundary between the first winding section 122a and the second winding section 122b, and is continuous with the second vertical flow path D22. Thus, a large amount of refrigerant can be introduced into the second vertical flow path D22. As a result, the refrigerant can be supplied to the first horizontal flow path D11 of the second winding section 122b at a sufficient flow rate by assisting the first vertical flow path D21a having a narrow width through the second vertical flow path D22, thereby improving the cooling efficiency of the refrigerant.

[0042] Furthermore, by disposing the insulation barrier 127 so as to cover the high electric field portion HV of the second cylindrical winding 122 , it is possible to improve the insulation resistance between the first cylindrical winding 121 and the second cylindrical winding 122 .

[0043] In the static induction device 100 of the present embodiment, when viewed from the vertical direction, each of the plurality of second insulating spacers 150 has a fan-shaped shape in which the circumferential length of the second cylindrical winding 122 increases from the inner circumference to the outer circumference of the second cylindrical winding 122. As a result, the width L2 of the end portion on the outer circumference side of the second horizontal flow path D12 viewed from the vertical direction can be made smaller than the width L1 of the end portion on the outer circumference side of the first horizontal flow path D11, and therefore, a larger amount of refrigerant can be introduced into the second vertical flow path D22 compared to the case where the first insulating spacer 140 is provided. In addition, the second winding section 122b can be efficiently cooled.

[0044] Figure 6 FIG. 4 is a partial cross-sectional view of a second insulating spacer showing a modified example. Figure 6 In Figure 5 The same cross-sectional view is used for illustration.

[0045] like Figure 6 As shown, in the static induction device of the modified example, when viewed from the vertical direction, each of the plurality of second insulating spacers 150a has a prism shape. Two recesses are formed in the second insulating spacer 150a to engage with the third spacer 133 and the fourth spacer 134 respectively.

[0046] When viewed from the vertical direction, the second horizontal flow path D12 has a narrow portion N whose width L3 is narrowest at the outer peripheral side of the connection portion connected to the second vertical flow path D22. As a result, a larger amount of refrigerant can be introduced into the second vertical flow path D22. In addition, the width of the second horizontal flow path D12 viewed from the vertical direction becomes larger on the outer peripheral side of the narrow portion N, so that the contact area between the refrigerant flowing in the second horizontal flow path D12 and the second cylindrical winding 122 can be increased. As a result, the first winding section 122a and the second winding section 122b can be cooled efficiently.

[0047] Although the embodiments of the present disclosure have been described, it should be understood that the embodiments disclosed this time are illustrative in all points and are not restrictive. The scope of the present disclosure is indicated by the claims, and it is intended that all changes within the meaning and scope equivalent to the claims are included.

Claims

1. A static sensing device, characterized in that: include: Iron core; a first cylindrical winding, the first cylindrical winding being wound around the iron core; a second cylindrical winding, the second cylindrical winding being wound around the iron core and being located outside the first cylindrical winding; An insulating cylinder, the insulating cylinder being arranged between the first cylindrical winding and the second cylindrical winding; as well as an insulating barrier, the insulating barrier being arranged on the outer peripheral side of the insulating tube, A first vertical flow path extending in a vertical direction for allowing refrigerant to flow is formed between the insulating cylinder and the second cylindrical winding. A plurality of horizontal flow paths are formed in the second cylindrical winding, the plurality of horizontal flow paths are arranged at intervals in the vertical direction, are continuous with the first vertical flow path and extend in the horizontal direction for the refrigerant to flow. The plurality of horizontal flow paths include a plurality of first horizontal flow paths and a second horizontal flow path having a width in a height direction greater than a width in a height direction of the first horizontal flow paths, The second cylindrical winding comprises: a first winding section, wherein only the plurality of first horizontal flow paths are formed in the first winding section; as well as a second winding section, the second winding section being arranged at intervals from the first winding section in the vertical direction, a plurality of first horizontal flow paths among the plurality of horizontal flow paths and a second vertical flow path extending in the vertical direction for the refrigerant to flow are each formed in the second winding section, The insulating barrier covers the upper surface and inner circumference of the second winding section, The second horizontal flow path is located at a boundary between the first winding section and the second winding section, and is continuous with the second vertical flow path.

2. The static induction device according to claim 1, characterized in that The invention also includes a plurality of insulating spacers, wherein the plurality of insulating spacers are sandwiched between the first winding section and the second winding section to ensure the second horizontal flow path. When viewed from the vertical direction, each of the plurality of insulating spacers has a fan-shaped shape in which the circumferential length of the second cylindrical winding increases from the inner circumference side to the outer circumference side of the second cylindrical winding.

3. The static induction device according to claim 1, characterized in that: The invention also includes a plurality of insulating spacers, wherein the plurality of insulating spacers are sandwiched between the first winding section and the second winding section to ensure the second horizontal flow path. When viewed from a vertical direction, the plurality of insulating spacers are in a rhombus shape. The second horizontal flow path has a narrow portion having the narrowest width at the outer peripheral side of a connection portion with the second vertical flow path when viewed from the vertical direction.

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