JPH0779054B2 - Induction winding - Google Patents

Description

TECHNICAL FIELD The present invention relates to an induction electric winding, and more particularly to an induction winding equipped with a cooling structure suitable for gas cooling.

[Prior Art] In a conventional induction winding, a plurality of coils are stacked in the height direction through horizontal fluid passages to form a disc-shaped winding layer, and the disc-shaped winding layer is , Disposed between the outer insulating cylinders to form vertical fluid passages between the disc-shaped winding layer and the inner and outer insulating cylinders, and the vertical fluid passages are alternately partitioned by appropriate flow plates at appropriate intervals. The cooling fluid is caused to flow between the coils.

For example, the induction winding described in JP-A-56-40214 has a good cooling performance in natural cooling when the cooling fluid is oil.

Recently, gas such as Freon gas has been used as a cooling fluid instead of conventional oil. In this case,
It was experimentally confirmed that good cooling performance cannot be obtained with the configuration described in the above publication. FIG. 3 is a longitudinal sectional view of a conventional induction electric winding, and FIG. 4 is a characteristic diagram showing a temperature distribution of the coil of FIG.

In FIG. 3, 1 is a coil, 2 is a flow-flow plate, 3 is an inner insulating cylinder, 4 is an outer insulating cylinder, and arrows show the flow of cooling gas. It has been found that when using, the backflow 5 occurs at the inflow portion of each of the bent-flow sections, as shown in FIG. This is because the cooling gas is blown up into the vertical fluid passage from the lower gas inflow portion in the upper portion of the straight-flow section as a jet flow, and the gas flow velocity is high in the horizontal fluid passage at the upper part of the straight-flow section and at the lower horizontal fluid passage. The flow tends to be slow in the passage, and the backflow 5 is generated in the lower part of the flow diverting section.

As a result, as shown in FIG. 4, it was confirmed that the temperature of the coil was higher in the lower part of the flow diverting section due to the influence of backflow.

It should be noted that although FIG. 3 shows a state in which the backflow occurs between the folding plate and the coil immediately above the folding plate, depending on the conditions, the backflow also occurs between the coils near the folding plate. To do.

[Problems to be Solved by the Invention] In the above-mentioned prior art, no consideration is given to the flow of a cooling fluid, that is, the flow of a fluid having a large inertial force such as gas as compared with the viscous force of oil. There is a problem that the coil temperature rises due to the reverse flow of the interflow.

The present invention has been made to solve the above-mentioned problems of the prior art. Even when gas is used as the cooling fluid, it is possible to prevent the occurrence of backflow in the inter-coil flow in each of the diverting sections and to cool each coil. It is an object of the present invention to provide an induction electric winding having a cooling structure that can achieve good and effective cooling.

[Means for Solving the Problems] In order to achieve the above object, in the configuration of the first invention relating to the induction electric winding of the present invention, a plurality of coils are arranged at intervals so as to form horizontal fluid passages. The disc-shaped winding layers are stacked in the height direction to form a disc-shaped winding layer, and the disc-shaped winding layers are arranged between the inner insulation cylinder and the outer insulation cylinder, and the disc-shaped winding layers and the inner and outer insulation layers are arranged. A space area is formed between the insulating cylinder and the inside and outside vertical fluid passages, and the inside and outside vertical fluid passages are alternately closed by a fold sheet for each predetermined number of coils to form a fold passage section. However, in the induction electric winding in which the fold plate is arranged in the range of the disk-shaped winding layer in the radial direction, and the gas for cooling is flowed in the fold plate, the fold plate is connected to the downstream outlet part. Arranged so that the gap g1 between the folding plate and the coil is smaller than the gap g2 between the folding plate and the coil on the upstream side, One ratio g1 and g2 is one that is set in a range of 1 / 5-1 / 3.

In addition, the configuration of the second invention relating to the induction electric winding of the present invention forms a disk-shaped winding layer by stacking a plurality of coils in the height direction at intervals so as to form horizontal fluid passages. , The disk winding layer is disposed between the inner insulating cylinder and the outer insulating cylinder so that inner and outer vertical fluid passages are formed between the disk winding layer and the inner and outer insulating cylinders. A space region is formed at the inner and outer vertical fluid passages, and the inner and outer vertical fluid passages are alternately closed by a predetermined number of coils to form a folded flow section.
In the induction electric winding in which the flow diverting plate is radially arranged within the range of the disk-shaped winding layer, and the gas for cooling is flowed therein, the flow diverting plate is provided at the outer peripheral end of the flow foldable plate. The protrusion is provided toward the side.

[Operation] In order to improve the cooling performance of the induction winding in gas cooling, it is necessary to prevent the backflow of the inter-coil flow, which is found below each of the bent sections (inflow section of gas flow). This backflow occurs because the flow of the inflow portion in each fold section becomes jet-like as shown in FIG. 3, and at the end of the fold plate, the insulating cylinder inside or outside from the coil side is formed. This is because the flow velocity toward

When the length of the flow fold plate is shortened and the distance between the upper flow fold plate and the coil is reduced as in the first aspect of the invention, the above flow at the end of the flow fold plate is eliminated, and the coil Backflow is not possible in the interflow. When the backflow does not occur, the distribution of the coil temperature in each of the bent-flow sections does not show a significant difference as in the case of the backflow, and the cooling of the coil becomes good.

Further, according to the second aspect of the invention, since the protruding portion is provided at the outer peripheral end of the flow fold plate toward the lower side, the jet-like gas flow from the upper part of the flow fold section to the lower part of the next flow fold section. And the same effect as the first invention is expected.

[Example] First, a prior art in the process of developing the present invention will be described with reference to FIG. FIG. 5 is a vertical cross-sectional view showing one bent-flow section of the induction-electric winding according to an example of the prior art of the present invention, and FIG. 2 shows the one-flow-flow section of the induction-electric winding shown in FIG. It is the partially broken perspective view shown.

In FIGS. 5 and 2, reference numeral 1 is a hollow disk-shaped (donut-shaped) coil, and this coil 1 is a thin copper plate wound in a cylindrical shape. The on-disk winding layers forming the induction electric winding are formed by stacking the coils 1 in the height direction with a spacer 9 sandwiched in between so as to maintain a space to form a horizontal fluid passage.

Reference numeral 2 is a flow fold plate arranged for each predetermined number of coils (five in the figure), 3 is an inner insulating cylinder, and 4 is an outer insulating cylinder. An inner insulating cylinder 3 and an outer insulating cylinder 4 are installed inside and outside a disk-shaped winding layer in which the coils 1 are laminated, while maintaining a space area to be a vertical fluid passage. Reference numeral 7 is an inner vertical fluid passage, and 8 is an outer vertical fluid passage. The flow diverter plate 2 alternately closes the inner and outer vertical fluid passages 7 and 8 to form a fold flow section in which the cooling gas flows in a fold flow, and in FIG. It shows the fold flow section.

The width n of the inner and outer vertical fluid passages 7 and 8 is set to about 1/3 to 1/5 of the radial length m of the coil.

In the example of the prior art shown in FIG. 5, the spacing between the coils 1 and the spacing between the coils 1 and the flow fold plate 2 are equal, and the radial length 1 of the flow fold plate 2 is either inside or outside. It is shorter than the sum of the width n of the vertical fluid passages 7 and 8 and the radial length m of the coil 1. That is, in FIG. 5, 1 <m + n. In the example of FIG. 5, the tip position of the flow fold plate 2 is 1/2 to 1/4 of the radial length m of the coil 1.
It is inside from the end face of the coil 1.

As the cooling fluid, a gas such as SF ₆ gas is used to fill the circumference of the coil of the disk-shaped winding layer, and this cooling gas flows from the bottom to the top when the temperature of the induction winding increases. The natural convection that naturally rises or forced convection due to a fan or the like causes the fluid to flow in the flow path as shown by the arrow.

By doing this, the lower side of the bent section (gas flow inflow section)
It was confirmed that the reverse flow of the inter-coil flow in 2) is eliminated, so that the cooling of each coil 1 is effectively performed and the temperature distribution of each oil 1 is made substantially uniform.

An embodiment of the present invention which has been further developed will be described below based on the technique of FIG.

FIG. 1 is a vertical cross-sectional view showing one bent-flow section of an induction electric winding according to an embodiment of the first aspect of the present invention. In the figure, those having the same reference numerals as those in FIG. 5 are the same parts as in the prior art example.

In FIG. 1, 1 is a hollow disk-shaped coil, 2-1 and 2
Reference numeral -2 is a flow fold plate arranged for each predetermined number of coils, 3 is an inner insulating cylinder, and 4 is an outer insulating cylinder. An inner insulating cylinder 3 and an outer insulating cylinder 4 are arranged inside and outside a disk-shaped winding layer in which the coils 1 are laminated, maintaining a space area to be a vertical fluid passage. Reference numeral 7 denotes an inner vertical fluid passage and 8 an outer vertical fluid passage.

In the embodiment shown in FIG. 1, the gap g ₁ between the upper folding plate 2-1 and the coil 1 is smaller than the gap g ₂ between the lower folding plate 2-2 and the coil 1. The folding plates 2-1 and 2-2 are arranged. In other words, the distance between the flow fold plate and the coil is
It is set narrow at the top of the bend section and wide at the bottom. In the embodiment shown in FIG. ₁ , the interval ratio of g ₁ and g ₂ is about 1/5 to 1/3. In this case, the positions of the tips of the flow fold plates 2-1 and 2-2 are set in the radial direction of the coil 1 from the end surface of the coil 1.
It is about 1/5 inside.

According to the embodiment shown in FIG. 1, it is possible to prevent a jet-like flow of the cooling gas from the upper part of the bent-flow section to the lower part of the next bent-flow section, and to reduce the flow rate of the cooling gas flowing between the coils. It has the effect of making it uniform, is effective for cooling each coil 1, and can make the temperature distribution of each coil 1 substantially uniform.

Next, FIG. 6 is a vertical cross-sectional view showing one rectifying section of the induction electric winding according to the second embodiment of the present invention.
In the figure, the parts denoted by the first reference numeral and FIG. 5 are the same parts as those in the example of the prior art, and therefore the description thereof will be omitted.

In the embodiment shown in FIG. 6, a bent portion 10 is formed by bending the outer peripheral end portion of the folding plate 2A downward, and is formed along the outer circumference.

In the embodiment shown in FIG. 6, between the coils 1 and between the coils 1
And the flow diverting plate 2A are arranged at equal intervals. Further, the position of the tip (outer peripheral end) of the folding plate 2A is set within a range of about 1/6 to 1/5 of the radial length of the coil 1 from the end face of the coil 1.

According to the embodiment shown in FIG. 6, the bent portion 10 of the flow fold plate 2A is
Since it has a function of suppressing the jet-like gas flow from the upper part of the mixed flow section to the lower part of the next mixed flow section, the same effect as that of the embodiment of FIG. 1 is expected. Moreover, the embodiment shown in FIG. 6 has the advantages that the distance between the coil 1 and the flow diverting plate 2 is equal to the distance between the coils, the workability is good as in the conventional case, and the flow velocity distribution can be easily controlled.

In the embodiment shown in FIG. 6, an example in which the outer peripheral end of the folding plate is bent has been described, but the same effect can be obtained even if the baffle member is attached without bending the folding plate itself. In short, it is sufficient to provide a downwardly projecting portion that functions as a baffle plate on the outer peripheral edge of the flow fold plate. Further, the protruding portion has a corresponding effect regardless of whether it is formed continuously or discontinuously along the circumference of the outer periphery of the flow distribution plate.

Next, FIG. 7 is a vertical cross-sectional view showing one bent-flow section of the induction-electric winding according to another embodiment of the second invention. In the figure,
The parts having the same reference numerals as those in FIG. 6 are the same parts, and therefore their explanations are omitted.

In the embodiment shown in FIG. 7, holes 11 are formed at a plurality of locations along the outer circumference in the vicinity of the bent portion 10 formed on the outer circumference end of the flow fold plate 2B. In the embodiment of FIG. 7, the intervals between the coils 1 and between the coils 1 and the flow diversion plate 2B are equal, and the tip of the flow diversion plate 2B is
It is provided slightly inward from the tip of the coil 1.

According to the embodiment shown in FIG. 7, since a part of the cooling gas whose jet flow is suppressed by the bending portion 10 flows through the hole 11,
Backflow is less likely to occur, which is more effective for uniformizing the flow between the coils, and a better cooling performance can be obtained.

In addition, in the embodiment of FIG. 7, the example in which the hole is provided in the vicinity of the bent portion at the outer peripheral end of the folding plate is described, but the hole formed in the folding plate is appropriate even if it is at a position other than the outer peripheral end. Will bring about the effect of. For example, although not particularly shown and described, in the induction electric winding having the basic configuration as in the embodiment shown in FIG. 1, a plurality of concentric circles are provided at a plurality of positions in the radial direction of the flow distribution plate 2. Even if the holes are opened, it is expected that the cooling gas will flow more smoothly and each coil will be cooled more effectively.

Next, FIG. 8 is a vertical cross-sectional view showing one rectifying section of the induction winding according to still another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 are the same parts, and the description thereof will be omitted.

In the embodiment shown in FIG. 8, the interval between the coils 1 in the flow break section is changed in the height direction in order to adjust the flow rate of the cooling gas. That is, the height dimension of the horizontal fluid passage located on the lower side of the folded flow section is the largest, and the height dimension of the horizontal fluid passage located on the upper side is the smallest. Further, the outer peripheral end surface of the flow fold plate 2 is inside about 1/5 to 1/3 of the radial length of the coil 1.

In the prior art in which the cooling fluid was oil, for example, Japanese Patent Laid-Open No.
As described in Japanese Patent No. 40214, the height dimension of the horizontal oil passage located in the upper portion of the flow break section is set larger than the height dimension of the horizontal oil passage located in the lower portion.

The difference in this configuration is due to the difference between the case where the cooling fluid is oil and the case where it is gas. In the case of oil, the flow velocity of oil was high in the lower part of the flow break section and slow in the upper part, but in the case of gas,
The gas flow velocity tends to be high in the upper part of the mixed flow section and slow in the lower part. That is, the gas is blown up in the upward direction through the vertical fluid passage from the gas inflow portion on the lower side of the straight flow section, and the configuration of the embodiment of FIG. 8 is suitable for such a flow of the cooling gas. It is what

According to the embodiment shown in FIG. 8, since the flow rates of the cooling gas flowing between the coils 1 can be made substantially equal, there is an effect that the cooling balance of the entire coil 1 is improved.

[Effects of the Invention] As described above, according to the present invention, even when gas is used as the cooling fluid, it is possible to prevent the occurrence of backflow in the inter-coil flow in each of the diverting sections, and to cool each coil well. It is possible to provide an induction winding with a cooling structure that is effectively made.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing one bent-flow section of an induction-electric winding according to an embodiment of the first invention, and FIG. 2 is a one-flow-flow section of the induction-electric winding shown in FIG. Is a partially cutaway perspective view showing
FIG. 3 is a longitudinal sectional view of a conventional induction winding, and FIG. 4 is
FIG. 5 is a characteristic view showing the temperature distribution of the coil of FIG. 3, FIG. 5 is a vertical cross-sectional view showing one fold section of the induction electric winding according to an example of the prior art of the present invention, and FIG. FIG. 7 is a vertical cross-sectional view showing one bent-flow section of the induction-electric winding according to one embodiment of the invention, FIG. 7 is one bent-flow section of the induction-electric winding according to another embodiment of the second invention. FIG. 8 is a vertical cross-sectional view showing one bent-flow section of an induction electric winding according to still another embodiment of the present invention. 1 …… Coil, 2,2-1,2-2,2A, 2B …… Folding plate, 3 ……
Inner insulation cylinder, 4 outer insulation cylinder, 5 reverse flow, 7 inner vertical fluid passage, 8 outer vertical fluid passage, 10 bent portion, 11 hole.

Claims (6)

[Claims] 1. A disk-shaped winding layer is formed by stacking a plurality of coils in the height direction at intervals so as to form horizontal fluid passages, and the disk-shaped winding layer is formed on the inner insulating cylinder and the outer surface. A space area is formed between the disk-shaped winding layer and the inner and outer insulating cylinders so as to form inner and outer vertical fluid passages, and the inner and outer vertical fluid passages. For a predetermined number of coils are alternately closed by a flow-flow plate to form a flow-flow section, and the flow-flow plate is radially arranged within the range of the disk-shaped winding layer, and is provided for cooling inside thereof. In the induction-electric coil winding for flowing gas, the flow diverting plate is arranged such that the gap g1 between the flow rectifying plate and the coil on the downstream side is smaller than the gap g2 between the flow rectifying plate and the coil on the upstream side. , And the ratio of g1 to g2 is set in the range of 1/5 to 1/3, the induction electric wire winding. 2. A disk-shaped winding layer is formed by stacking a plurality of coils in the height direction at intervals so as to form horizontal fluid passages, and the disk-shaped winding layer is formed on the inner insulating cylinder and the outer side. A space area is formed between the disk-shaped winding layer and the inner and outer insulating cylinders so as to form inner and outer vertical fluid passages, and the inner and outer vertical fluid passages. For a predetermined number of coils are alternately closed by a flow-flow plate to form a flow-flow section, and the flow-flow plate is radially arranged within the range of the disk-shaped winding layer, and is provided for cooling inside thereof. In the induction current winding for flowing gas, the folding plate is provided with a protruding portion downwardly provided on an outer peripheral end of the folding plate. 3. The induction winding according to claim 2, wherein the projection is formed by bending an outer peripheral end of the flow fold plate downward. 4. The induction winding according to claim 2, wherein the protrusion has a baffle member attached to the lower side of the outer peripheral end of the flow fold plate. 5. The flow fold plate according to any one of claims 2 to 4, wherein the flow fold plate has a plurality of holes provided along an outer periphery thereof in the vicinity of the projecting portion of the flow fold plate. And induction winding. 6. The flow fold plate according to claim 1, wherein the flow fold plate is provided with a plurality of holes at a plurality of radial positions of the flow fold plate. Inductor winding.