JPH0584045B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a disk type transformer for high frequency induction heating (hereinafter simply referred to as a disk type transformer).
The present invention relates to a secondary coil and a manufacturing method thereof.

<Conventional technology> First, a conventional technique will be explained with reference to the drawings.

Fig. 6 is a drawing for explaining the secondary coil of a conventional disk type transformer, and Fig. 6a
6 is an exploded perspective view of the disk type transformer, FIG. 6b is a plan view of the secondary coil, and FIG. 6c is a sectional view taken along the line A--A in FIG. 6b.

As shown in FIG. 6a, the disk type transformer consists of a pair of spaced electric copper hollow rectangular pipes 11 which are wound in an elliptical shape, for example, five times in a vertical plane.
A secondary coil 20 is provided between the primary coils 10a, 10b made of 100% polyester, and is wound once in an oval shape in a vertical plane with Teflon insulating plates 30, 30 interposed between the primary coils 10a, 10b. 10b and insulating plates 30, 3
0 to each oval central opening 1 of the secondary coil 20
5a, 15b, 35, 35, 25 and the outer periphery of the core (not shown) (magnetic material such as ferrite)
surrounded by.

The primary coils 10a, 10b are wound the same number of times in the same direction with a gap between each turn. Pipe joints 12 are attached to both ends of the square pipes 11 that form the primary coils 10a and 10b, and cooling liquid is supplied from a cooling main water pipe (not shown), passing from the outer circumferential end to the inner circumferential end for cooling. It is becoming possible to make liquid.

The secondary coil 20 is formed into a substantially oval shape, as shown in detail in FIGS. Copper pipes 21-26 and copper pipes 21-23
Straight copper tubes 21a to 23a connected to one end
, straight copper tubes 24a to 26a connected to one end of the copper tubes 24 to 26, copper tubes 21a to 26b connected to the other ends of the copper tubes 21 to 26, and copper tubes 21a to 26a.
Header 201 connected to 23a and copper pipe 24
a header 202 connected to a to 26a, a header 203 connected to copper pipes 21b to 26b,
Pipe joint 20 connected to a cooling main water pipe (not shown)
6, 207, a pipe 204 that connects the pipe joint 206 and the header 201, and a pipe 205 that connects the pipe joint 207 and the header 202. In addition, the copper pipes 21 to 26 and the copper pipes 21a to 26a
The connections with the copper pipes 21b to 26b and the connections between each copper pipe and the header are also made by brazing.

Copper tubes 21-26, 21a-26a, 21b-2
6b are hollow rectangular copper tubes, and the hollow portions 27 of the copper tubes 21 to 26 and the copper tubes 21a to 2
The hollow parts (not shown) of 6a, 21b to 26b are
It serves as a passage for the cooling fluid of the secondary coil. The cooling liquid supplied from the main cooling water pipe (not shown) to the pipe joint 206 passes through the pipe 204 and the header 201.
Divided liquid to copper pipes 21a to 23a, copper pipes 21 to 23,
It reaches the header 203 through the copper pipes 21b to 23b, then branches to the copper pipes 24b to 26b, and then reaches the header 202 through the copper pipes 24 to 25 and the copper pipes 24a to 26a, and then the pipe 205 and the pipe joint 207. It returns to the main cooling water pipe. In addition, Fig. 4b
, arrows without symbols indicate the direction in which the coolant flows.

<Problems to be Solved by the Invention> However, the secondary coil 20 of the disk type transformer described above has the following problems.
That is, in order to manufacture the secondary coil 20, it is not only necessary to cut and bend a large number of hollow rectangular copper tubes, and to braze the copper tubes together, but also to prepare the headers 201 to 203 and the pipe 204. ,205
It also requires installation, making it extremely time-consuming to manufacture.

Furthermore, in order to help reduce the labor involved in manufacturing the disk type transformer, if brazing is replaced with soldering, the solder will melt due to the high temperature rise when the disk type transformer is used.

The present invention has been devised in view of the above circumstances, and includes a secondary coil for a disk type transformer, which has a small temperature rise, does not melt the solder used in assembly, and does not require much time and effort to manufacture. The purpose is to provide a manufacturing method.

<Means for Solving the Problems> In order to solve the above problems, the invention according to claim 1 is used in a disk type transformer for high frequency induction heating, and has a pair of holes in the central opening and one end in the longitudinal direction. In a plate-shaped secondary coil having an approximately elliptical shape with an open end, two coils are provided at one open end.
The secondary coil has a cooling liquid supply port and a discharge port, and a cooling liquid passage provided between the supply port and the discharge port in the secondary coil, and the cooling liquid passage is connected to the supply port and has an inner peripheral portion. A first coolant passage formed so as to reach the other open end via the first coolant passage, and a second coolant passage formed so as to be conductive to the first coolant passage and reach the one open end via the outer peripheral portion. a third coolant passage formed adjacent to the second coolant passage and connected to the second coolant passage to the other open end; and a third coolant passage connected to the third coolant passage; A fourth coolant passage is provided adjacent to the first coolant passage, and is formed so as to reach one open end and communicate with the discharge port.

The invention according to claim 2 also provides a substantially elliptical plate-shaped transformer for use in a disk-type transformer for high-frequency induction heating, which has a central opening and a pair of open ends at one end in the longitudinal direction. In the next coil,
It has a cooling liquid supply port and a discharge port for the secondary coil provided at one open end, and a cooling liquid passage provided between the supply port and the discharge port in the secondary coil, and the cooling liquid passage is , a first coolant passage formed to reach the other open end via the outer circumferential portion connected to the supply port, and a first coolant passage formed to extend to the other open end via the inner circumferential portion connected to the first coolant passage. a second coolant passage formed as shown in FIG. A fourth coolant passage is formed so as to be connected to the third coolant passage, to be adjacent to the first coolant passage, and to reach one open end and to be connected to the discharge port.

The invention according to claim 3 provides a method for manufacturing a secondary coil of a disk-type transformer for high-frequency induction heating, in which a first plate-like substantially oblong plate having a central opening, which is one component of the secondary coil, is provided. The process of manufacturing a metal plate, 2 on one surface of the first metal plate.
Next, a step of forming partition walls on both sides of the first groove constituting the coolant passage of the coil, and after forming a second groove filled with solder at the top of the partition, this groove is formed. After placing the second metal plate, which is the other component of the secondary coil and has a shape corresponding to the first metal plate, on the top of the partition wall of the first metal plate, the first metal plate is filled with solder. and a step of fixing the first and second metal plates by heating the second metal plate and melting the solder.

<Function> In the secondary coil of the invention according to claim 1,
The cooling liquid sequentially passes through the inner circumferential portion, the outer circumferential portion, and the portion between the outer circumferential portion and the inner circumferential portion, and is then discharged to the outside of the secondary coil.

In the secondary coil of the invention according to claim 2,
The cooling liquid sequentially passes through the outer circumferential portion, the inner circumferential portion, and the portion between the inner circumferential portion and the outer circumferential portion, and is then discharged to the outside of the secondary coil.

In the method for manufacturing a secondary coil according to the invention according to claim 3, a first metal plate forming a cooling liquid passage for the secondary coil is formed on the surface of a first metal plate having a substantially elliptical shape having a central opening. By drilling a groove, partition walls are formed on both sides of this groove, and a second groove is further formed at the top of this partition, and after this groove is filled with solder, it is connected to the first metal plate. A second metal plate having a shape is placed on top of the partition wall of the first metal plate. Next, the first and second metal plates are heated to melt the solder and fix the first and second metal plates.

<Example> Hereinafter, an example of a secondary coil of a disk type transformer and a method for manufacturing the same according to the present invention will be described with reference to the drawings. 1 to 4 are drawings for explaining the first embodiment, and FIG. 1 is A--A in FIG. 2.
FIG. 2 is a plan view of the first copper plate of the secondary coil, FIG. 3 is an explanatory diagram of the manufacturing method, and FIG. A plan view before drilling the groove, Figure 3b is the same as A in Figure 3a.
- An end view as seen from the arrow A; Figure 3c is a plan view after the grooves for the coolant passages have been bored in the first copper plate; Figure 3d is
is an end view taken along line A--A in FIG. 3c, and FIG. 4 is a perspective view of the secondary coil. FIG. 5 is a drawing corresponding to FIG. 2 of the second embodiment. Figures 2 and 5
In the figures, unmarked arrows indicate the direction in which the coolant flows.

First, a first example will be described.

As shown in Figures 1, 2 and 4, 2
The secondary coil 100 includes a substantially oval copper plate (first copper plate) 50 which is one component of the secondary coil 100 and has a central opening 60;
00, a copper plate (second copper plate) 80 having a shape corresponding to that of the copper plate 50 and joined to the copper plate 50.

As shown in FIGS. 1 and 2, by carving four parallel grooves (first grooves) 51 to 54 with a rectangular cross section on one surface of the copper plate 50, Inner peripheral portion (periphery of central opening 60) 64
and the partition wall 5 of the outer peripheral portion 65 of the copper plate 50.
9 and three partition walls 55 between partition walls 56 and 59 are formed. These grooves 51 to 54 constitute coolant passages 71 to 74 of the secondary coil 50, respectively.

Note that a linear slit 63 is formed at one end in the longitudinal direction of the copper plate 51 to conduct from the central opening 60 to the outer peripheral portion 65 of the copper plate 50.
has a one-turn, approximately Ω-shaped shape with one end open. By forming this slit 63, a pair of open ends 61 (one open end) and 6
2 (the other open end) is formed. Both end portions of a high frequency heating coil (not shown) are connected to these open ends 61 and 62.

A copper plate 80 having a shape corresponding to that of the copper plate 50 is placed on the partition walls 55, 56, and 59, and is placed in the grooves 51 to 54.
is covered. Protrusions 56a and 59a each having a rectangular cross-section and a height equal to the thickness of the copper plate 80 are protruded from the upper parts of the partition walls 56 and 59.
The upper surface of the copper plate 80 and the protrusions 56a, 5 placed on the
It is considered that the top surface of 9a is on the same plane.

The copper plates 50 and 80 are connected to the partition walls 55, 56,
It is fixed by solder 58 filled in a groove (second groove) 57 bored at the top of the groove 59 . Further, the open end portion 61 is provided with a discharge port 68 and a discharge port 69 for the cooling liquid to the secondary coil 100.
Piping (not shown) is connected to the supply port 68 and the discharge port 69.

The cooling liquid passages 71 to 74 are configured as follows. That is, the coolant passage is connected to a coolant passage 71 (a first coolant passage) formed so as to be conducted to the supply port 68 and reach the open end portion 62 via the inner peripheral portion 64; A coolant passage 72 (second coolant passage) formed to reach the open end 61 via the outer peripheral portion 65;
The open end 62 is connected to the coolant passage 71 and is adjacent to the coolant passage 71 .
A coolant passage 73 (third coolant passage) formed to reach the open end 61 connected to the coolant passage 73 and adjacent to the coolant passage 71 and a discharge port 6
The coolant passage 74 (fourth coolant passage) is formed to be electrically connected to the cooling liquid passage 9 .

Next, the operation of this embodiment will be explained.

When the coolant is supplied to the coolant supply port 68, the coolant passes through the coolant passages 71, 72, 73, and 74 in order, and passes through the inner circumferential portion 64 and then the outer circumferential portion 6.
5 is first cooled, and then a portion between the outer peripheral portion 65 and the inner peripheral portion 64 is cooled, and then discharged to the outside of the secondary coil 50 via the discharge port 69.

When measuring the temperature rise of each part when the conventional secondary coil 100 is used, it is generally known that the inner peripheral part and the outer peripheral part have the largest temperature rise. In this embodiment, as described above, the coolant path is selected so that the coolant first passes through the inner circumferential portion 64 and then passes through the outer circumferential portion 65, so that these portions are sufficiently cooled. As a result, the temperature rise in these parts is low.

Next, a method of manufacturing this secondary coil 100 will be explained. First, a copper plate is cut to form a substantially oval annular copper plate 50 having a central opening 60 and a protrusion 66 at one end in the longitudinal direction, as shown in FIG. 3a. 66, a linear shallow groove 67 connecting the central opening 60 and the outer peripheral portion 65 of the copper plate 50 is bored.

After this, for example, using NC processing equipment, the third
As shown in FIGS. c and d, the grooves 51 to 54 that will become the coolant passages 71 to 74 are dug, the partition walls 55, 56, and 59 are formed in the copper plate 50, and then the partition walls 55, 56, and 59 are formed in the copper plate 50.
5, 56, and 59, grooves 57 are similarly drilled using an NC processing device or the like. In addition, a supply port 68 and a discharge port 69 for the cooling liquid are opened.

Next, the groove 57 is filled with solder 58 . Then, a copper plate 80 manufactured in a shape corresponding to the copper plate 50
are placed on the partition walls 55, 56, 59 to form the secondary coil 100, and then the secondary coil 100 is
is placed in an electric furnace or the like and heated to melt the solder 58 and fix the copper plates 50 and 80. After this, copper plate 5
The groove 67 of the protrusion 66 of No. 0 is removed to form the slit 63, and the fabrication of the secondary coil 100 is completed.

In this embodiment, before forming the slit 63, the grooves 51 to 54 which will become the coolant passages and the grooves 57 filled with solder are drilled with the groove 67 formed at the position of the slit 63, and the copper plate 50 and 80, but this is because these grooves 51 to 54, 5
In order to prevent the copper plate 50 from being distorted as much as possible when drilling the grooves 67 and 7, if the grooves 51 to 54 and 57 can be drilled by fixing the copper plate 50 appropriately so as not to be distorted, the grooves 67 The slits 63 are suddenly formed without forming the grooves 51 to 5.
4,57 may be bored.

Next, a second example will be described. The main structure and manufacturing method of the secondary coil of the second embodiment are the same as those of the secondary coil 100 of the first embodiment, but as shown in FIG. 5, only the selection of the coolant path is different. There is. In FIG. 5, parts equivalent to those in FIG. 2 are given the same reference numerals.

The coolant passage is connected to the supply port 68 and the outer peripheral portion 6
5 to the open end 62; A coolant passage 72 (a second coolant passage) and a coolant passage 73 (a third coolant passage) formed so as to be connected to the coolant passage 72 and reach the open end 62 adjacent to the coolant passage 72. ), and a coolant passage 74 formed so as to be in communication with the coolant passage 73, adjacent to the coolant passage 71, reaching the open end 61, and communicating with the discharge port 69.

When the coolant is supplied to the coolant supply port 68, the coolant sequentially passes through the coolant passages 71, 72, 73, and 74, and first cools the outer circumferential portion 65 and the inner circumferential portion 64, and then cools the inner circumferential portion. 64 and outer peripheral portion 65
After cooling the portion between the two, it is discharged to the outer periphery of the secondary coil 50 via the discharge port 69.

In this embodiment as well, the coolant path is selected so that the coolant first passes through the outer circumferential portion 65 and then through the inner circumferential portion 64, as described above, so that these portions are sufficiently cooled. As a result, the temperature rise in these parts is low.

In addition, in the above embodiment, the secondary coil is made of copper plate 50,
80 has been described, however, it is not limited to a copper plate, and may be made of a metal with good conductivity.

<Effects of the Invention> As explained above, in the secondary coil of the disk type transformer according to claims 1 and 2, the inner circumferential portion and the outer circumferential portion where the temperature increase is the largest are replaced with other portions, that is, the inner circumferential portion. Since the portion between the inner circumferential portion and the outer circumferential portion is cooled prior to cooling, the temperature rise in the inner circumferential portion and the outer circumferential portion is low. Therefore, the solder used to manufacture these secondary coils will not melt during use of the disc type transformer.

Further, the method for manufacturing a secondary coil of a disk type transformer according to claim 3 provides a method for manufacturing a secondary coil of a disk type transformer, which is a first component of a secondary coil, and a substantially elliptical plate-like first metal plate having a central opening. A first groove that constitutes a coolant passage for the secondary coil is drilled, partition walls are formed on both sides of this groove, and a second groove formed at the top of this partition is filled with solder. After placing the second metal plate, which is the other component of the coil and has a shape corresponding to the first metal plate, on the top of the partition of the first metal plate, the first and second metal plates are heated and soldered. Melt it,
The first and second metal plates are fixed. Therefore, the method for manufacturing a secondary coil of the present invention does not require cutting, bending, brazing, etc. of a large number of hollow rectangular copper tubes as in the conventional manufacturing method, so manufacturing is simple and requires no effort.

[Brief explanation of drawings]

1 to 4 are drawings for explaining the first embodiment, in which FIG. 1 is a sectional view taken along line A-A in FIG. 2, and FIG. FIG. 3 is a plan view of the first copper plate, and FIG. 3 is an explanatory diagram of the manufacturing method. FIG. Figure 3a is an end view taken along the line A-A, Figure 3c is a plan view of the first copper plate after the grooves that serve as coolant passages have been bored, and Figure 3d is Figure 3c.
FIG. 4 is a perspective view of the secondary coil. FIG. 5 is a drawing corresponding to FIG. 2 of the second embodiment. FIG. 6 is a drawing for explaining the secondary coil of a conventional disk type transformer, in which FIG. 6 a is an exploded perspective view of the disk type transformer, FIG. 6 b is a plan view of the secondary coil, and FIG.
FIG. 6c is a sectional view taken along the line A--A in FIG. 6b. 50...Copper plate, 51-54...Groove, 55,5
6, 59...Partition wall, 57...Groove, 58...Solder,
60... central opening, 61, 62... open end,
64...Inner circumference part, 65...Outer circumference part, 68...
Supply port, 69...Discharge port, 71-74...Cooling liquid passage, 80...Copper plate, 100...Secondary coil.

Claims (1)

[Claims] 1. Used in a disk type transformer for high frequency induction heating, with 1 at the center opening and at one end in the longitudinal direction.
A substantially oblong plate having a pair of open ends.
The secondary coil has a supply port and a discharge port for the cooling fluid of the secondary coil provided at one open end thereof, and a cooling fluid passage provided between the supply port and the discharge port in the secondary coil, and The coolant passage includes a first coolant passage formed so as to be connected to the supply port through an inner circumferential portion and reach the other open end, and a first coolant passage formed to be connected to the first coolant passage and reach the other open end via an outer circumferential portion. a second coolant passage formed to reach the end; and a third cooling liquid passage connected to the second coolant passage and formed adjacent to the second coolant passage to the other open end. A fourth coolant passageway is provided, the fourth coolant passageway being connected to the third coolant passageway, adjacent to the first coolant passageway, and extending to one open end and communicating with the discharge port. A secondary coil of a disk type transformer for high frequency induction heating, which is characterized by: 2 Used in disk type transformers for high frequency induction heating, with 1 in the central opening and one longitudinal end.
A substantially oblong plate having a pair of open ends.
The secondary coil has a supply port and a discharge port for the cooling fluid of the secondary coil provided at one open end thereof, and a cooling fluid passage provided between the supply port and the discharge port in the secondary coil, and The coolant passage includes a first coolant passage that is connected to the supply port, passes through the outer circumferential portion, and reaches the other open end; a second coolant passage formed to reach the end; and a third cooling liquid passage connected to the second coolant passage and formed adjacent to the second coolant passage to the other open end. a fourth coolant passage, the fourth coolant passage being connected to the third coolant passage, adjacent to the first coolant passage, reaching one open end and communicating with the discharge port. A secondary coil of a disk type transformer for high frequency induction heating, which is characterized by: 3. A method for manufacturing a secondary coil of a disk-type transformer for high-frequency induction heating, including the step of manufacturing a first metal plate having an approximately oval shape and having a central opening, which is one component of the secondary coil; forming partition walls on both sides of the groove by drilling a first groove constituting a cooling fluid passage for the secondary coil in one surface of the first metal plate; applying solder to the top of the partition wall; After forming a second groove to be filled, the groove is filled with solder, and the second metal plate, which is the other component of the secondary coil and has a shape corresponding to the first metal plate, is connected to the first metal plate. A disk type for high-frequency induction heating, comprising the step of fixing the first and second metal plates by heating the first and second metal plates to melt the solder and fixing the first and second metal plates after placing them on the top of the partition wall. A method of manufacturing a secondary coil of a transformer.