Stasis Inducer

Abstract

To provide a stationary inductor capable of reducing size and weight while ensuring cooling performance.SOLUTION: A stationary inductor 1 according to an embodiment includes a tank 2 provided with an inlet and an outlet for a refrigerant, an iron core 5 disposed inside the tank 2 and having a plurality of legs 5a, a plurality of coils 6 attached to the legs 5a of the iron core 5 and formed with internal flow paths through which the coolant flows, and a T-partition 12 as a straightening member that divides the inside of the tank 2 into an inlet side and an outlet side at least in part, and straightens the internal flow path located on the inlet side and the internal flow path located on the outlet side such that the refrigerant flows in series.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] SUMMARY OF THE INVENTION An embodiment of the present invention relates to a static inductor. [Background technology]

[0002] BACKGROUND ART Conventionally, as disclosed in Patent Document 1, for example, static inductors such as transformers having a coil attached to an iron core are known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-283757 Summary of the Invention [Problem to be solved by the invention]

[0004] Such static inductors require a certain size because they are cooled by circulating a refrigerant such as cooling oil inside the tank, but in recent years there has been a demand for smaller and lighter inductors.

[0005] However, if the flow rate is increased to ensure the necessary cooling performance, the pump performance needs to be strengthened, which may result in an increase in the size of the pump, and therefore in the size of the entire stationary inductor.

[0006] Therefore, a static inductor that can be made smaller and lighter while ensuring cooling performance is provided. [Means for solving the problem]

[0007] The stationary inductor of the embodiment includes a tank having an inlet and an outlet for the refrigerant, an iron core arranged inside the tank and having a plurality of legs, a plurality of coils attached to the legs of the iron core and having internal flow paths through which the refrigerant flows, and a rectifying member that divides at least a portion of the inside of the tank into an inlet side and an outlet side and rectifies the refrigerant so that it flows in series between the internal flow path located on the inlet side and the internal flow path located on the outlet side. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram schematically illustrating a configuration of a static inductor according to a first embodiment. [Figure 2] A diagram showing the configuration of the iron core and coil [Figure 3] Schematic diagram of the clamp configuration [Figure 4] Schematic diagram showing the structure of a T-shaped partition [Figure 5] Schematic diagram showing the flow of refrigerant inside the tank [Figure 6] Diagram explaining the effects of a static inductor [Figure 7] FIG. 10 is a diagram illustrating a flow of refrigerant in a stationary inductor according to a second embodiment. [Figure 8] FIG. 1 is a diagram illustrating a configuration of a circulation member; [Figure 9] FIG. 10 is a diagram showing a schematic arrangement of a circulation member; [Figure 10] 10A and 10B are diagrams illustrating the configuration and arrangement of a box-shaped partition according to a third embodiment; [Figure 11] Schematic diagram showing the flow of refrigerant inside the tank [Figure 12] FIG. 1 is a schematic diagram illustrating a configuration example of a static inductor according to a fourth embodiment. [Figure 13] Schematic diagram of a static inductor configuration example (part 2) [Figure 14] FIG. 10 is a diagram schematically illustrating a configuration example of a static inductor according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, several embodiments will be described with reference to the drawings. Furthermore, parts that are substantially common to the embodiments will be denoted by the same reference numerals.

[0010] (First embodiment) A first embodiment will be described below. As shown in Fig. 1, a stationary induction device 1 of this embodiment includes a tank 2 having an inlet and an outlet for a refrigerant, a cooler 3 for cooling the refrigerant, a pump 4 for circulating the refrigerant between the tank 2 and the cooler 3, an iron core 5 disposed inside the tank 2, and a plurality of coils 6 attached to the iron core 5. For the sake of explanation, Fig. 1 shows the interior of the tank 2 in a partially see-through state.

[0011] The tank 2 is formed, for example, from a steel plate, and is formed into a flat rectangular container shape whose left-right and front-to-back lengths are longer than its up-down length, as shown in a plan view from above in an installed state, a side view from the side, and a front view from the front. Hereinafter, the left-right length will also be referred to as the width, the left-right direction will also be referred to as the width direction, the front-to-back length will also be referred to as the depth, the front-to-back direction will also be referred to as the depth direction, the up-to-down length will also be referred to as the height, and the up-to-down direction will also be referred to as the height direction.

[0012] To the rear surface of the tank 2, there are connected pipes that connect the tank 2 to the cooler 3, an inlet pipe 7 which is the inlet side of the refrigerant to the tank 2, and an outlet pipe 8 which is the outlet side of the refrigerant from the tank 2. In other words, the inlet pipe 7 and the outlet pipe 8 that connect the tank 2 to the cooler 3 are concentrated on one side of the tank 2. The inlet pipe 7 and the outlet pipe 8 are also arranged so that the space occupied by the pipes in the left-right and up-down directions is generally within the range of the width and height of the tank 2.

[0013] The cooler 3 is composed of a pipe (not shown) through which the refrigerant flows and a heat dissipation fin (not shown) connected to the surface of the pipe, and cools the refrigerant by removing heat from the refrigerant flowing through the pipe through heat exchange with outside air. Note that the configuration of the cooler 3 described here is one example, and other configurations for cooling the refrigerant can also be used.

[0014] In this embodiment, cooling oil is assumed to be the refrigerant. Therefore, a pump 4 capable of circulating a liquid such as cooling oil is provided in the middle of the outlet pipe 8. When the pump 4 is driven, the refrigerant is sucked out from the inside of the tank 2, flows through the outlet pipe 8 to the cooler 3, is cooled in the cooler 3, and then flows into the inside of the tank 2 through the inlet pipe 7, thereby circulating. However, the refrigerant is not limited to a liquid, and a gas such as dry air can also be used. In that case, a pump 4 capable of circulating a gas is adopted. In other words, the refrigerant may be any so-called fluid.

[0015] 2, the iron core 5 is formed in a generally annular shape and has two legs 5a on which the coil 6 is attached and two yokes 5b connecting the legs 5a. As is well known, the iron core 5 is formed by laminating thin steel plates, and during manufacturing, the iron core 5 is cut in at least one location to attach the coil 6. After the coil 6 is attached, and in this embodiment, a rectifying member (described later) is attached, the iron core is shaped into an annular shape.

[0016] Each coil 6 is formed by winding a conductor into a generally cylindrical shape centered on the leg 5a. Hereinafter, the vertical direction in plan view, i.e., the front-to-rear direction of the stationary inductor 1, will also be referred to as the axial direction, and the outward direction centered on the leg 5a in front view will also be referred to as the radial direction. The right side in the drawing, located on the refrigerant inlet side, will be referred to as coil 6A, and the left side in the drawing, located on the outlet side, will be referred to as coil 6B. However, when describing the coil 6 in general, they will be simply referred to as coil 6 without the A or B designations.

[0017] In this embodiment, each coil 6 is composed of a first coil 61 disposed on the outer periphery of the leg portion 5a as seen from the front, and a second coil 62 disposed concentrically on the outer periphery of the first coil 61 with a predetermined gap 9 therebetween. This gap 9 is connected to both axial end surfaces of the coil 6 and forms an internal flow path through which the refrigerant flows inside the coil 6. Therefore, in this embodiment, the gap 9 of the coil 6A forms an internal flow path located on the inlet side, and the gap 9 of the coil 6B forms an internal flow path located on the outlet side.

[0018] As shown in FIG. 1, the iron core 5 and coil 6 are attached to a predetermined position inside the tank 2 by a clamp 10. As shown in FIG. 3, the clamp 10 has a length in the left-right direction slightly smaller than the width of the tank 2 when viewed from the front, and is generally U-shaped when viewed from the side. More specifically, the clamp 10 has a first support surface 10a that supports the yoke portion 5b of the iron core 5 from above and below, a second support surface 10b formed by bending the lower end of the first support surface 10a in the figure and supporting the coil 6 from its axial end face, and a reinforcing surface 10c formed by bending the upper end of the first support surface 10a in the figure and ensuring the strength of the first support surface 10a. Furthermore, as will be described in detail later, the second support surface 10b has a plurality of through holes 10d formed therein for allowing the refrigerant to pass through. The reinforcing surface 10c can also be configured to be used as a fixing surface when fixing the clamp 10 to the tank 2.

[0019] As shown in the arrangement and as seen from the side in Fig. 1, these clamps 10 are arranged such that the first support surfaces 10a sandwich the yoke portion 5b from above and below at the front and rear ends of the core 5, and the second support surfaces 10b sandwich the coil 6 in the axial direction. In this case, both left and right ends of the second support surface 10b of each clamp 10 are fixed to the inner surface of the tank 2 by fixing members. Note that the clamp 10 on the front end side and the clamp 10 on the rear end side can also be configured to be connected and fixed to each other by a rod-shaped connecting member (not shown).

[0020] Furthermore, clamp 10, which supports iron core 5 from below in the direction of gravity when stationary inductor 1 is installed, has support member 11 provided between first support surface 10a and the inner surface of tank 2. Therefore, when stationary inductor 1 is installed, first support surface 10a is supported from below by support member 11, making it possible to reliably support iron core 5 and coil 6 in predetermined positions. However, the shape and fixing structure of clamp 10 shown here are merely examples, and a different fixing structure can be used as long as it can fix iron core 5 and coil 6 in predetermined positions.

[0021] The stationary induction device 1 includes a T-shaped partition 12, which corresponds to a rectifying member, located inside the tank 2 at a position on the rear end side of the coil 6. As shown in a plan view in FIG. 4, the T-shaped partition 12 has a first wall portion 12a extending in the front-rear direction and a second wall portion 12b extending in the left-right direction from the front end of the first wall portion 12a. In other words, the T-shaped partition 12 has a very simple configuration, basically consisting of two flat plate-like members connected in a T-shape. A plurality of spacers 13 are provided between the front end side of the coil 6 and the clamp 10. The spacers 13 are arranged so as not to completely fill the gap 9.

[0022] The first wall portion 12a is formed in a plate shape with a length in the front-rear direction that is approximately the length from the rear end surface of the coil 6 to the rear surface of the tank 2, and a height direction that is approximately equal to the height of the tank 2, and is located approximately in the center in the left-right direction of the second wall portion 12b. As shown in a side view, the first wall portion 12a is formed with an opening 12c for passing the yoke portion 5b and the first support surface 10a therethrough, and a slit 12d that is connected to the opening 12c and for passing the second support surface 10b and the reinforcing surface 10c therethrough.

[0023] As shown in Fig. 4 in a front view, the second wall portion 12b is formed in a plate shape whose left-right length is approximately equal to the width of the tank 2 and whose up-down length is approximately equal to the height of the tank 2. In other words, the second wall portion 12b is formed to have a shape that is approximately equal to the cross-sectional shape of the tank 2 when viewed from the front. The second wall portion 12b also has an escape hole 12e (shown by a chain line) for passing the leg portion 5a of the iron core 5 therethrough, and a plurality of guide holes 12f formed in the circumferential direction around the escape hole 12e. The guide holes 12f penetrate the second wall portion 12b and are formed at positions corresponding to the internal flow passages formed in the coil 6, that is, the gaps 9 (shown by a two-dot chain line) in this embodiment.

[0024] When this T-shaped partition 12 is placed inside the tank 2, the first wall portion 12a is located approximately in the center of the left and right sides of the tank 2 as shown in the arrangement mode, and the opening 12c and the slit 12d are blocked by the iron core 5 and the clamp 10 as shown in the plan view and side view of Figure 1. As a result, the inside of the tank 2 is divided by the first wall portion 12a into a space (R1) on the inlet side of the refrigerant and a space (R2) on the outlet side.

[0025] That is, the T-shaped partition 12 divides at least a portion of the interior of the tank 2 into an inlet side and an outlet side. The T-shaped partition 12 also divides the interior of the tank 2 by the second wall portion 12b into a space behind the second wall portion 12b and a space in front of the second wall portion 12b.

[0026] In this case, as shown in Fig. 5, the refrigerant flowing and circulating inside the tank 2 is guided by guide hole 12f on the inlet side from the rear end surface of coil 6A to the internal flow path, i.e., gap 9, and is discharged from the front end surface of coil 6A via gap 9. The refrigerant discharged from gap 9 of coil 6A then passes through gap 9 of coil 6B and reaches the space on the outlet side from guide hole 12f, and then flows out of the tank 2 through outlet piping 8. Note that Fig. 5 shows only essential parts for ease of explanation.

[0027] That is, in the case of the stationary induction generator 1, the refrigerant flows serially through the inlet space (R1), the internal flow path of the coil 6A, the internal flow path of the coil 6B, and the outlet space (R2) inside the tank 2. In this embodiment, the outer edge of the T-shaped partition 12 is sealed against the inner surface of the tank 2 by a sealing member (not shown).

[0028] Next, the operation of the above-described stationary inductor 1 will be described. As mentioned above, there is a demand for a smaller and lighter static inductor 1. Here, "smaller and lighter" means a smaller and lighter static inductor 1 as a whole, including piping, while still maintaining the performance required for the static inductor 1.

[0029] However, if the pump performance is strengthened to ensure the necessary cooling performance, there is a risk that the pump 4 will become larger, which in turn will increase the size of the entire static induction device 1. Also, if there are many restrictions on the position of the piping connecting the tank 2 and the cooler 3, the installation space will become larger, which could result in the size of the entire static induction device 1.

[0030] Therefore, in this embodiment, the above-described T-shaped partition 12 is provided inside the tank 2. As described above, the T-shaped partition 12 divides at least a part of the inside of the tank 2 into an inlet side space and an outlet side space, and functions as a flow straightening member that straightens the refrigerant so that it flows serially through the divided spaces while passing through the internal flow path.

[0031] The provision of this T-shaped partition 12 makes it possible to efficiently cool the static induction device 1. Hereinafter, for convenience, a conventional, general configuration shown as a comparative example in Fig. 6 will be referred to as a conventional static device 101, with the inlet for the refrigerant to the tank 2 indicated as IN and the outlet for the refrigerant from the tank 2 indicated as OUT. For the sake of simplicity of explanation, Fig. 6 is presented as a schematic representation of the configurations of the static induction device 1 and the conventional static device 101, and some reference numerals have been omitted.

[0032] As shown in Fig. 6 as a comparative example (configuration), conventional stator 101 has an iron core 5 and a coil 6 inside tank 2. For comparison, it is assumed that the tank 2, iron core 5, coil 6, pump 4, and cooler 3 of conventional stator 101 are the same as those of static inductor 1. However, in the case of conventional stator 101, since both coils 6A and 6B arranged inside tank 2 become a flow path for the refrigerant, if an inlet is provided on the rear side of tank 2, for example, an outlet will be provided on the front side of tank 2 opposite the inlet.

[0033] In the case of conventional still device 101, the refrigerant flows and circulates in parallel and approximately evenly inside coils 6A and 6B arranged inside tank 2, as indicated by the open arrows. In other words, in the case of conventional still device 101, the refrigerant flows at a flow velocity (V1) through a space with a flow path area (S1) that indicates the cross-sectional area of ​​the flow path, as shown schematically in the comparative example (flow path).

[0034] In contrast, in the case of the stationary induction device 1, as shown as an embodiment (configuration), the inlet side space (R1) and the outlet side space (R2) inside the tank 2 are separated by a first wall portion 12a of a T-shaped partition 12. Also, the space behind (above in the figure) the rear end of the coil 6 is separated from the space ahead (above in the figure) of the rear end of the coil 6 by a second wall portion 12b. The second wall portion 12b is provided with a plurality of guide holes 12f at positions corresponding to the internal flow paths.

[0035] Therefore, in the case of the stationary induction device 1, the refrigerant is guided from the inlet space (R1) inside the tank 2 through the guide hole 12f to the internal flow path of the coil 6A as shown by the white arrow, and after flowing inside the coil 6A, reaches the space on the front end side inside the tank 2 and turns back, and is guided to the outlet space (R2) through the internal flow path of the coil 6B. In other words, in the case of the stationary induction device 1, the refrigerant that cools the coil 6 flows in series through two spaces with a flow path area (S2) that indicates the cross-sectional area of ​​the flow path, as shown schematically in the example (flow path).

[0036] In this case, if the tank 2, iron core 5, and coil 6 of the static inductor 1 and the conventional stator 101 have the same configuration, the flow path area (S2) in the static inductor 1 will be half the flow path area (S1) in the conventional stator 101. Then, according to Bernoulli's theorem, it can be seen that the flow velocity (V2) in the static inductor 1 will be greater than the flow velocity (V1) of the refrigerant in the conventional stator 101.

[0037] Here, we will explain the difference in temperature rise of the coil 6. Note that the temperature rise of the coil 6 referred to here is defined as the difference between the measured temperature of each part of a transformer and the reference ambient temperature in, for example, the Japanese Industrial Standard JIS C 4304 and the Electrical Standards Research Council standard JEC-2200-2014 in the case of a transformer.

[0038] First, as shown by flag G1 in the comparative example (temperature rise), assume that the temperature of the refrigerant in the conventional stator 101 is T1 at the inlet (P1). In this case, the temperature of the refrigerant rises along the refrigerant flow from the rear end position (P2) of the coil 6 toward the front end position (P3) of the coil 6, and finally rises by ΔTo1 at the outlet (P4) from the inlet temperature (T1). Then, as shown by graph G2, the temperature of the coil 6 is calculated from the refrigerant temperature, and the temperature rise (ΔTc1) of the coil 6 is obtained.

[0039] On the other hand, as shown by flag G11 in the example (temperature rise), assume that the refrigerant temperature in stationary induction device 1 is T11 at the inlet (P11). In this case, the refrigerant temperature rises along the refrigerant flow from the rear end position (P12) of coil 6A to the front end position (P13) of coil 6A, with almost no temperature rise in the space where the refrigerant turns back, and then rises again along the flow from the front end position (P14) of coil 6B to the rear end position (P15), and at the outlet (P16) it has risen by ΔT02 from the inlet temperature (T11). Then, as shown by graph G12, the temperature of coil 6 is calculated based on the refrigerant temperature, and the temperature rise (ΔTc2) of coil 6 is obtained.

[0040] In this case, even if the inlet temperatures (T1, T11) are the same in the conventional stator 101 and the static inducer 1, the refrigerant flow rate is faster in the static inducer 1, so the temperature rise (ΔTc2) of the coil 6 of the static inducer 1 is smaller than the temperature rise (ΔTo1) of the coil 6 of the conventional stator 101. In other words, by providing the T-shaped partition 12, the flow path area of ​​the refrigerant can be made relatively small, and the actual cooling performance can be improved.

[0041] If the cooling performance can be improved in this way, it becomes possible to ensure the necessary cooling performance even if the tank 2 is made smaller and the refrigerant flow rate is reduced. Also, for example, if the configuration of the tank 2, iron core 5, coil 6, etc. is the same, it becomes possible to make the pump 4 smaller. Furthermore, because the cooling performance is improved, it is possible to increase the capacity without changing the outer shape of the tank 2, iron core 5, or coil 6. In other words, it is possible to achieve relatively high performance with a smaller tank 2, which previously required a larger tank 2.

[0042] Furthermore, in the case of the stationary inducer 1, the refrigerant is circulated in a folded manner inside the tank 2, so that the inlet pipe 7, which serves as the inlet for the refrigerant, and the outlet pipe 8, which serves as the outlet, can be concentrated on one side of the tank 2. This reduces the constraints on piping arrangement compared to a configuration such as the conventional stationary inducer 101, in which the inlet and outlet are formed on different sides and the piping from the outlet to the cooler 3 has to be arranged around the periphery of the tank 2 or arranged around other structures, making it easier to route the inlet pipe 7 and the outlet pipe 8 and reducing the space required for their arrangement.

[0043] According to the static inductor 1 described above, the following effects can be obtained. The stationary inductor 1 comprises a tank 2 having an inlet and an outlet for the refrigerant, an iron core 5 arranged inside the tank 2 and having a plurality of legs 5a, a plurality of coils 6 attached to the legs 5a of the iron core 5 and forming an internal flow path through which the refrigerant flows, and a rectifying member that divides at least a portion of the inside of the tank 2 into an inlet side and an outlet side and rectifies the refrigerant so that it flows in series through the internal flow path that forms the inlet side and the internal flow path that forms the outlet side.

[0044] By providing the straightening member, the cross-sectional area of ​​the refrigerant flow path inside the tank 2 becomes smaller than when the cross-sectional area of ​​the entire coil 6 is used as the flow path as in the past. Furthermore, a smaller cross-sectional area of ​​the flow path increases the flow rate relatively, thereby improving cooling performance. As a result, for example, if the shape of the tank 2 is the same, the performance required of the pump 4 is reduced, making it possible to make the pump 4 more compact. Alternatively, a static induction device 1 that conventionally required a large tank 2 can be realized with a smaller tank 2. Therefore, the static induction device 1 can be made smaller and lighter.

[0045] In addition, in the stationary induction device 1, each coil 6 is composed of a first coil 61 arranged on the leg portion 5a side and a second coil 62 arranged concentrically around the first coil 61 with a gap 9 interposed therebetween, which functions as an internal flow path. The T-shaped partition 12 serving as a rectifying member is formed by a first wall portion 12a that divides the interior of the tank 2 into a space on the inlet side and a space on the outlet side of the refrigerant, and a second wall portion 12b that is connected to the first wall portion 12a in a manner that covers the end faces of each of the coils 6 on the inlet side and the outlet side, and that has a plurality of guide holes 12f for guiding the refrigerant at positions corresponding to the gap 9.

[0046] This allows the flow straightening member to be easily manufactured by combining roughly flat plate-shaped members in a T-shape, and also allows the flow of the refrigerant to be straightened without providing a complex structure inside the tank 2.

[0047] Also, instead of spacer 13, a member equivalent to second wall portion 12b may be provided on the front end surface side of coil 6. Furthermore, stationary inductor 1 is not limited to those mounted on vehicles, but can be applied to general voltage conversion transformers, current transformers for current conversion, and those for impedance conversion and insulation.

[0048] (Second embodiment) The second embodiment will be described below. In the second embodiment, another member for rectifying the refrigerant is arranged on the opposite side of the T-shaped partition 12 described in the first embodiment. Therefore, the basic configuration of the stationary induction device 1 is the same as in the first embodiment, and therefore the second embodiment will be described with reference to the drawings of the first embodiment as necessary. In other words, the second embodiment can be combined with the first embodiment.

[0049] As shown schematically in Fig. 7, in the stationary induction device 1 of this embodiment, a return member 20 is arranged inside the tank 2 on the opposite side of the coil 6 from the T-shaped partition 12. As shown in Fig. 8, this return member 20 is formed in a box shape as a whole, and one surface facing the coil 6 covers the end faces of each coil 6, and on one surface thereof are formed a plurality of holes 20a through which the refrigerant passes, at positions corresponding to the gap 9, i.e., the internal flow path, and an escape hole 20b for passing the iron core 5.

[0050] Clamps 10 are disposed inside the circulation member 20, and each clamp 10 has a through-hole 10d formed in a second support surface 10b on the coil 6 side. In this embodiment, the circulation member 20 is formed with a volume that is fixed to the inner surface of the tank 2 by the clamps 10. Note that in FIG. 7, the clamp 10 on the inlet side is not shown for the sake of simplicity. Clamps 10 of different shapes may also be used.

[0051] 9, the rear end of the coil 6, which is at the top in the figure, is partitioned into an inlet space and an outlet space by a T-shaped partition 12, and the front end of the coil 6 guides the refrigerant discharged from the gap 9 of the coil 6A to the gap 9 of the coil 6B by the return member 20. In other words, the return member 20 prevents the refrigerant discharged from the gap 9 of the coil 6A from diffusing into the space between the coils 6, for example.

[0052] As a result, as shown in Fig. 7, after passing through the internal flow path of coil 6A, the refrigerant is guided to coil 6B by circulation member 20 and flows intensively through the internal flow path of coil 6B. That is, the refrigerant flows and circulates in series through the internal flow paths of coil 6A and coil 6B. This prevents a decrease in the flow rate of the refrigerant, that is, a decrease in cooling performance.

[0053] In this way, the return flow member 20 is arranged on the opposite side of the T-shaped partition 12 serving as a straightening member across the coil 6, is formed in a box shape, has one side covering the end face of each coil 6, and has multiple holes 20a through which the refrigerant passes at positions corresponding to the internal flow path, and folds the refrigerant that has passed through the internal flow path of the inlet coil 6 back toward the internal flow path of the outlet coil 6. This configuration also makes it possible to increase the flow rate of the refrigerant compared to a configuration in which the entire cross section of the coil 6 is the flow path, and makes it possible to reduce the size and weight of the static inductor 1, thereby achieving the same effects as in the first embodiment.

[0054] (Third embodiment) The third embodiment will be described below. The third embodiment is a modified example of the second embodiment, and is configured to include a box-shaped rectifying member instead of the T-shaped partition 12 described in the first embodiment. Furthermore, since the basic configuration of the stationary inductor 1 is common to the first embodiment and other embodiments, the description will be made with reference to the drawings described in the first or second embodiment as necessary. In other words, the third embodiment can be combined with the first and second embodiments.

[0055] 10, the box-shaped partition 30 serving as the flow straightening member in the third embodiment is basically formed in the same shape as the return member 20 described in the second embodiment, being box-shaped, with one surface covering the end face of the coil 6 and having a plurality of guide holes 30a formed on that surface at positions corresponding to the internal flow paths through which the refrigerant passes. Also, on the other surface on the inlet and outlet sides of the box-shaped partition 30, there are formed introduction holes 30b serving as refrigerant inlets into the box-shaped partition 30 and discharge ports 30c serving as refrigerant outlets from the box-shaped partition 30. Also, on the inner periphery of the guide holes 30a, there are formed relief holes 30d through which the iron core 5 passes.

[0056] An inner partition 30e is provided inside the box-shaped partition 30 to separate the entrance side from the exit side. This inner partition 30e has a configuration generally similar to that of the first wall portion 12a of the T-shaped partition 12, and divides the interior of the box-shaped partition 30 into the entrance side and the exit side, and has openings for passing the yoke portion 5b and the first support surface 10a. Note that, for the sake of simplicity, only the outer frame of the inner partition 30e is shown in FIG. 10.

[0057] When the box-shaped partition 30 is disposed inside the tank 2 as shown in the arrangement mode, the rear end face of the coil 6 on the upper side in the figure is covered by the box-shaped partition 30, and the front end face of the coil 6 on the lower side in the figure is covered by the return member 20. As a result, as shown schematically in Fig. 11, the flow of the refrigerant that has flowed into the tank 2 is directed by the box-shaped partition 30 toward the internal flow path of the coil 6A on the inlet side, and the refrigerant discharged from the internal flow path of the coil 6B on the outlet side is rectified so that it flows toward the outlet.

[0058] As a result, the refrigerant is guided from the box-shaped partition 30 to the internal flow path of the coil 6A, then guided by the return member 20 to the coil 6B side via the internal flow path of the coil 6A, reaches the box-shaped partition 30 again via the internal flow path of the coil 6B, and then flows out of the tank 2 from the outlet, circulating by flowing in series through the internal flow paths of the coil 6A and the coil 6B.

[0059] Even with this configuration, the flow rate of the refrigerant can be increased compared to a configuration in which the entire interior of the tank 2 serves as a flow path, and the static inductor 1 can be made smaller and lighter, thereby achieving the same effects as the first and second embodiments.

[0060] In addition, in this embodiment, the circulation member 20 and the box-shaped partition 30 are shown separately, but by blocking the inlet hole 30b and the outlet 30c with, for example, a plate member, the circulation member 20 and the box-shaped partition 30 can have the same basic structure. Furthermore, when used as the circulation member 20, if it is close to or in contact with the inner surface of the tank 2, the inlet hole 30b and the outlet 30c do not need to be blocked.

[0061] (Fourth embodiment) The fourth embodiment will be described below. In the fourth embodiment, the arrangement of the members connected to the outside of the tank 2 will be mainly described. In addition, since the basic configuration of the stationary induction device 1 is common to the first embodiment and the like, the description will also refer to the drawings described in the first to third embodiments as necessary. In other words, the fourth embodiment can be combined with the first to third embodiments.

[0062] When the stationary inductor 1 is mounted on a vehicle, for example, the installation space may be limited. For example, since the tank 2, which houses the iron core 5 and coil 6 inside, is the heaviest part, if the tank 2 is installed in a location where it can be firmly fixed, the length of the piping between the tank 2 and the cooler 3 must be short, and it may not be possible to install the pump 4.

[0063] Therefore, as shown in Figure 12, in a configuration in which the inlet and outlet of the refrigerant are concentrated on one surface of the tank 2 facing one axial end face of the coil 6, an auxiliary outlet pipe 40 serving as an auxiliary outlet for allowing the refrigerant that has flowed through the internal flow path on the inlet side to flow out of the tank 2, and an auxiliary inlet pipe 41 serving as an auxiliary inlet for allowing the refrigerant that has flowed out of the auxiliary outlet pipe 40 to flow into the inside of the tank 2 are provided on the other surface of the tank 2 facing the other end face of the coil 6, and a cooler 3 is arranged between the inlet and outlet of the tank 2, and a pump 4 is arranged between the auxiliary outlet pipe 40 and the auxiliary inlet pipe 41 of the tank 2.

[0064] Specifically, as shown in configuration example 1, for example, an I-shaped partition 42 is disposed between the inlet coil 6 and the outlet coil 6 and serves as a rectifying member that divides the interior of the tank 2 almost entirely into a space on the inlet coil 6 side and a space on the outlet coil 6 side, and a flat partition 43 is provided at the end of the coil 6, and the pump 4 can be disposed between the auxiliary outlet pipe 40 and the auxiliary inlet pipe 41. This flat partition 43 has a configuration that is almost the same as that of the second wall portion 12b described above.

[0065] As a result, the refrigerant flows in series through the internal flow path of the inlet coil 6A and the internal flow path of the outlet coil 6B, improving cooling performance. Since the flat partition 43 can be arranged inside the tank 6 together with the I-shaped partition 42A, it is formed, for example, in a shape with an opening for the I-shaped partition 42 to pass through, or in a shape that can be separated into left and right halves as shown by the I-shaped partition 42. It is also possible to form the flat partition 42B as an integral unit, and arrange the I-shaped partitions 42A of different lengths above and below the flat partition 42B as shown.

[0066] Furthermore, as shown in configuration example 2, in a configuration in which the T-shaped partitions 12 described in the first embodiment are provided on both axial end face sides of the coil 6, a pump 4 can be arranged between the auxiliary outlet pipe 40 and the auxiliary inlet pipe 41. This allows the refrigerant to flow serially through the internal flow path of the inlet-side coil 6A and the internal flow path of the outlet-side coil 6B, thereby improving cooling performance.

[0067] Furthermore, as shown in Configuration Example 3, a configuration can be adopted in which the box-shaped partition 30 described in the third embodiment is provided on each end face of the coil 6, and the pump 4 is disposed between the auxiliary outlet pipe 40 and the auxiliary inlet pipe 41. In Configuration Example 3, the box-shaped partition 30 is hatched for ease of identification. This allows the refrigerant to flow serially through the internal flow path of the inlet coil 6A and the internal flow path of the outlet coil 6B, thereby improving cooling performance. Note that a configuration can also be adopted in which the return member 20 described in the second embodiment is provided instead of the box-shaped partition 30 on the lower side shown in the figure.

[0068] Furthermore, as shown in Configuration Example 4, as a modification of Configuration Example 1, the T-shaped partition 12 described in the first embodiment can be provided at one axial end of the coil 6, and a short I-shaped partition 42 can be provided to separate the lower side of the T-shaped partition 12 into the coil 6A side and the coil 6B side. This allows the refrigerant to flow serially through the internal flow path of the inlet side coil 6A and the internal flow path of the outlet side coil 6B, thereby improving cooling performance.

[0069] Incidentally, it is expected that the size of components that can be placed will be limited due to installation space constraints. For example, it is possible that a cooler 3 large enough to ensure the necessary cooling performance cannot be placed on one side of the tank 2. In that case, as shown in Fig. 13 , an auxiliary outlet pipe 40 that allows the refrigerant that has flowed through the internal flow path on the inlet side to flow out of the tank 2 and an auxiliary inlet pipe 41 that allows the refrigerant that has flowed out of the auxiliary outlet pipe 40 to flow into the tank 2 can be provided on the other side of the tank 2 that is located opposite to the one side on the inlet side. A pump 4 that circulates the refrigerant and a first cooler 3a that cools the refrigerant can be placed between the inlet and outlet of the tank 2, and a second cooler 3b that cools the refrigerant can be placed between the auxiliary outlet pipe 40 and the auxiliary inlet pipe 41 of the tank 2.

[0070] Specifically, as shown in configuration example 5, an auxiliary outlet pipe 40 and an auxiliary inlet pipe 41 can be provided in the tank 2 provided with the I-shaped partition 42 and flat partition 43 described in configuration example 1, and a second cooler 3b can be provided between the auxiliary outlet pipe 40 and the auxiliary inlet pipe 41 to compensate for the cooling performance that is insufficient with just the first cooler 3a.

[0071] Furthermore, as shown in the sixth configuration example, an auxiliary outlet pipe 40 and an auxiliary inlet pipe 41 can be provided in the tank 2, in which T-shaped partitions 12 are arranged on both end faces of the coil 6, and a second cooler 3b can be provided between the auxiliary outlet pipe 40 and the auxiliary inlet pipe 41.

[0072] Furthermore, as shown in the seventh configuration example, an auxiliary outlet pipe 40 and an auxiliary inlet pipe 41 can be provided in the tank 2, in which box-shaped partitions 30 are arranged on both end faces of the coil 6, and a second cooler 3b can be provided between the auxiliary outlet pipe 40 and the auxiliary inlet pipe 41.

[0073] Furthermore, as shown in configuration example 8, a tank 2 is provided with a T-shaped partition 12 provided at one end in the axial direction of the coil 6 and a short I-shaped partition 42 that separates the lower side of the T-shaped partition 12 into the coil 6A side and the coil 6B side, and an auxiliary outlet pipe 40 and an auxiliary inlet pipe 41 are provided in the tank 2, and a second cooler 3b is provided between the auxiliary outlet pipe 40 and the auxiliary inlet pipe 41.

[0074] With these configurations, for example, it is possible to increase the degree of freedom in the size of the cooler 3, i.e., it is possible to eliminate restrictions on the installation space. Also, for example, it is possible to increase the degree of freedom in the size of the cooler 3, i.e., it is possible to eliminate restrictions on the installation space. Of course, it is possible to increase the flow rate of the refrigerant compared to a configuration in which the entire interior of the tank 2 serves as a flow path, and it is possible to achieve size and weight reduction, and it is also possible to obtain the same effects as the first to third embodiments.

[0075] (Other embodiments) In each embodiment, a configuration has been exemplified in which the inside of the tank 2 is generally divided into the coil 6A side and the coil 6B side, but as shown in Figure 14, a straightening partition plate 50 that divides the inside of the tank 2 in another manner can be provided, and a configuration in which the refrigerant flows in series through each space can be adopted.

[0076] As shown in the ninth configuration example, the space corresponding to half the circumference of coil 6A and the space corresponding to half the circumference of coil 6B can be partitioned as an inlet space and an outlet space, respectively. In this case, by changing the structure of T-shaped partition 12 described in the first embodiment, it is possible to configure a rectifying partition plate 50 that partitions each half circumference.

[0077] Specifically, in the first embodiment, the first wall portion 12a was formed in a T-shape in a plan view to divide the interior of the tank 2 into left and right sections, but by forming it to be T-shaped in a side view to divide the interior of the tank 2 in the vertical direction, it is possible to form a refrigerant flow as shown in configuration example 9.

[0078] Furthermore, as shown in Configuration Example 10, by combining the configuration of the first embodiment with the configuration shown in Configuration Example 9, the refrigerant flows halfway around the inlet coil 6A toward the depth of the page, turns around, and flows the remaining halfway around the coil 6A toward the front of the page, then flows halfway around the outlet coil 6B, flows halfway around the coil 6B toward the depth of the page, turns around, and flows halfway around the coil 6B toward the front of the page, thereby allowing the refrigerant to flow serially through each space. In this case, as described in Configuration Example 9, the first wall portion 12a of the T-shaped partition 12 can be configured to be T-shaped in a plan view that divides the interior of the tank 2 into left and right sections, and also T-shaped in a side view, that is, cross-shaped in a front view, thereby allowing the refrigerant flow as shown in Configuration Example 10.

[0079] Furthermore, as shown in Configuration Example 11, even in a configuration in which three or more coils 6 are arranged, the interior of the tank 2 can be divided into multiple spaces, and the refrigerant can flow in series through each space. In this case, by combining Configuration Examples 9 and 10, the second wall portion 12b of the T-shaped partition 12 is formed to a size corresponding to the three coils 6A to 6C, and the first wall portion 12a is combined with a T-shaped portion in a plan view and a T-shaped portion in a side view, or with a cross-shaped portion in a front view, a refrigerant flow as shown in Configuration Example 11 can be formed.

[0080] Even with this configuration, the flow rate of the refrigerant can be increased compared to a configuration in which the entire cross section of the coil 6 serves as a flow path, and the stationary induction device 1 can be made smaller and lighter. In addition, by combining this with the basic configuration of the box-shaped partition of the second embodiment or the third embodiment, the flow of the refrigerant can be adjusted. In addition, by combining this with the fourth embodiment, the degree of freedom in the size of the pump 4 and the cooler 3 can be increased, and restrictions on installation space can be eliminated.

[0081] Furthermore, not only in this embodiment but also in the first to fourth embodiments, the T-shaped partition 12, the box-shaped partition 30, or the I-shaped partition 42 serving as a straightening member may have a split-type configuration. Specifically, in the case of the T-shaped partition 12, the first wall portion 12a and the second wall portion 12b may be splittable, or the first wall portion 12a and the second wall portion 12b may be splittable near the center in the front-to-rear direction in a side view, or the second wall portion 12b may be splittable at the center in the up-to-down direction in a plan view.

[0082] Alternatively, in the case of a box-shaped partition, the hole 20a can be formed so that one side facing the coil 6 can be separated from the other side. This improves the workability when attaching the rectifying member and the return member 20.

[0083] In addition, although each embodiment has been exemplified as a configuration in which the gap 9 is an internal flow path, if a space through which the refrigerant flows is formed between the wound conductors that form the coil 6, that space can also be included in the internal flow path.

[0084] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0085] In the drawings, 1 is a stationary inductor, 2 is a tank, 3 is a cooler, 3a is a first cooler, 3b is a second cooler, 4 is a pump, 5 is an iron core, 5a is a leg portion, 5b is a yoke portion, 6, 6A, 6B, and 6C are coils, 61 is a first coil, 62 is a second coil, 7 is an inlet piping (inlet), 8 is an outlet piping (outlet), 9 is a gap (internal flow path), 10 is a clamp, 12 is a T-shaped partition (straightening member), 12a is a first wall portion, 12b is a second wall portion, 12f is a guide hole, 20 is a return member, 20a is a hole portion, 30 is a box-shaped partition (straightening member), 30a is a guide hole, 40 is an auxiliary outlet piping (auxiliary outlet), 41 is an auxiliary inlet piping (auxiliary inlet), 42 is an I-shaped partition (straightening member), 43 is a flat partition 43, and 50 is a straightening partition plate (straightening member).

Claims

1. a tank provided with an inlet and an outlet for the refrigerant; an iron core disposed inside the tank and having a plurality of legs; a plurality of coils attached to the plurality of legs of the core, respectively, each having an internal flow path through which the refrigerant flows; a flow straightening member that divides at least a portion of the inside of the tank into an inlet side and an outlet side, and straightens the refrigerant so that it flows in series through the internal flow path located on the inlet side and the internal flow path located on the outlet side, and also in the axial direction inside the coil; A static inductor comprising:

2. each of the coils is composed of a first coil disposed on the leg side and a second coil disposed concentrically on the outer circumferential side of the first coil with a gap interposed therebetween that functions as the internal flow path; 2. The stationary induction device according to claim 1, wherein the rectifying member is formed by a first wall portion that divides the interior of the tank into an inlet space and an outlet space for the refrigerant, and a second wall portion that is connected to the first wall portion in a manner that covers the end faces of the coils that are on the inlet side and the outlet side, and has a plurality of guide holes for guiding the refrigerant at positions corresponding to the gap.

3. 3. The stationary induction device according to claim 1, further comprising a return member arranged on the opposite side of the coil from the straightening member, the return member being formed in a box shape with one side covering the end faces of each of the coils and having a plurality of holes through which the refrigerant passes at positions corresponding to the internal flow paths, and which folds back the refrigerant that has passed through the internal flow paths of the coil on the inlet side towards the internal flow paths of the coil on the outlet side.

4. each of the coils is composed of a first coil disposed on the leg side and a second coil disposed concentrically on the outer circumferential side of the first coil with a gap interposed therebetween that functions as the internal flow path; 2. The stationary induction device according to claim 1, wherein the rectifying member is formed in a box shape with one surface covering the end surfaces of the coils, and has a plurality of holes formed on the one surface at positions corresponding to the gaps through which the refrigerant passes, so that the rectifying member directs the flow of refrigerant that has flowed into the tank toward the internal flow path of the coil on the inlet side and directs the flow of refrigerant that has been discharged from the internal flow path of the coil on the outlet side toward the outlet.

5. 2. The stationary inductor according to claim 1, wherein the rectifying member is disposed between the inlet side coil and the outlet side coil, and divides the interior of the tank into a space on the inlet side coil side and a space on the outlet side coil side.

6. 5. The stationary induction device according to claim 1, further comprising an auxiliary partition plate disposed inside the tank on the opposite side of the rectifying member across the coil, the auxiliary partition plate dividing the interior of the tank into an inlet side and an outlet side in a range from the inner surface of the tank to at least the end of the coil.

7. 7. The stationary inductor according to claim 1, wherein the inlet and outlet for the refrigerant are concentrated on one surface of the tank opposite to the axial end surface of the coil.

8. an auxiliary outlet for allowing the refrigerant that has flowed through the internal flow path on the inlet side to flow out of the tank, and an auxiliary inlet for allowing the refrigerant that has flowed out from the auxiliary outlet to flow into the tank, on another surface of the tank that is located on the opposite side to the one surface; a cooler for cooling the refrigerant is disposed between the inlet and the outlet of the tank; 8. The stationary inductor according to claim 7, wherein a pump for circulating the refrigerant is disposed between the auxiliary outlet and the auxiliary inlet of the tank.

9. an auxiliary outlet for allowing the refrigerant that has flowed through the internal flow path on the inlet side to flow out of the tank, and an auxiliary inlet for allowing the refrigerant that has flowed out from the auxiliary outlet to flow into the tank, on another surface of the tank that is located on the opposite side to the inlet surface; a pump for circulating the refrigerant and a first cooler for cooling the refrigerant are disposed between an inlet and an outlet of the tank; 8. The stationary inductor according to claim 7, further comprising a second cooler disposed between the auxiliary outlet and the auxiliary inlet of the tank for cooling the refrigerant.

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