Positioning tool for heat setting processing of insulation paper of mica capacitor

Abstract

The utility model discloses a positioning tool for heat setting processing of insulation paper of a mica capacitor, which comprises a transverse bottom plate, an inner core column and an outer template, the inner core column and the outer template are mounted on the bottom plate, and the transverse section of the inner core column which is consistent with the core of the mica capacitor in appearance and larger in size is rectangular or similar to rectangular. The transverse shape of the inner wall of the hollow outer template with the upper end and the lower end opened is the same as the transverse shape of the outer wall of the inner core column, the outer template surrounds the inner core column, and an annular gap used for containing insulation paper of the mica capacitor is formed between the outer wall of the inner core column and the inner wall of the outer template. According to the utility model, the inner core column and the outer template are installed on the bottom plate and the annular gap is formed, and during use, the insulation paper of the mica capacitor is placed in the annular gap and then is subjected to heat setting processing, so that the purpose that the inner side and the outer side of the insulation paper are coated with epoxy resin with uniform thickness in the mica capacitor filled with epoxy resin is finally realized; and the insulating property and the anti-cracking property of the mica capacitor are obviously improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of processing devices of mica capacitor insulating paper, in particular to a kind of positioning tool for mica capacitor insulating paper heat setting processing. BACKGROUND

[0002] Mica capacitor is a kind of capacitor using natural mica material with excellent insulation characteristics as core medium, widely used in aviation, aerospace, electric power, communication, military and precision instruments and meters and many other industries, meet the diversification needs of related electrical equipment to capacitor miniaturization, large capacity, high frequency, low loss etc.

[0003] In order to reduce the volume of mica capacitor, part of mica capacitor uses epoxy resin packaging layer instead of shell, in order to improve the insulation performance and crack resistance of this kind of mica capacitor, a layer of special fiber paper will be added as insulating paper in epoxy resin packaging layer, the insulating paper has good insulation performance and strength, and has certain elasticity, in order to ensure that its crack resistance is not affected in the process of pouring epoxy resin, it is required that the insulating paper cannot appear fold, and the core (or core group) of mica capacitor is generally approximately cuboid shape, so how to form approximately cuboid shape in epoxy resin as far as possible for insulating paper is not easy.

[0004] In the above epoxy resin pouring process of mica capacitor, the traditional pouring mode is to first tightly package capacitor core in mold, then insulating paper is placed in mold around the outer side of capacitor core, the insulating paper is limited by the interlayer space between mold and capacitor core, then epoxy resin is injected, and the epoxy resin pouring process is completed after it is solidified, and the epoxy resin packaging layer with built-in insulating paper is used as the insulating shell of this kind of mica capacitor.

[0005] The traditional pouring mode has the following defects: since the insulating paper has elasticity and cannot have creases, the insulating paper is limited by the interlayer space between the mold and the capacitor core to form an elliptical shape, the midpoint positions of the four sides of the elliptical insulating paper contact the inner wall of the mold to form outer support point positions, and the positions on the insulating paper corresponding to the four corners of the capacitor core contact the four corners of the capacitor core to form inner support point positions, the positions of the insulating paper located at the four outer support point positions, the four inner support point positions and the positions near the four outer support point positions and the four inner support point positions are not easily covered by the epoxy resin, and there is a paper leakage defect, especially the positions corresponding to the outer support point positions are greatly weakened in protection ability and mechanical properties at these key positions due to insufficient epoxy resin, the ability of the product to cope with complex environments and mechanical stress is reduced, the quality and service life of the product are seriously affected, the exposed part of the insulating paper is easy to absorb moisture in the air, the insulation performance is reduced, and the risk of electrical failure is increased, which seriously damages the electrical performance of the product; meanwhile, the amount of epoxy resin on the inner side and the outer side of the insulating paper is obviously different, and the thickness is obviously uneven, resulting in unbalanced performance of each part of the product, affecting the stability and reliability of the whole product; in addition, the positions on the insulating paper corresponding to the inner support point positions are affected by stress during the curing process of the epoxy resin, which increases the risk of cracking and reduces the anti-cracking performance of the product; and the joint position of the insulating paper has low adhesion, which also reduces the insulation performance and anti-cracking performance of the product.

[0006] At present, there is no positioning tool and technology for shaping the insulating paper, so the insulating paper can only be made to form a shape close to an elliptical shape in the epoxy resin pouring process by various artificial intervention methods, but the effect is not ideal, and the above problems cannot be effectively solved. Practical new type content

[0007] The purpose of the present application is to provide a positioning tool for hot shaping of mica capacitor insulating paper.

[0008] The present application achieves the above-mentioned purposes by the following technical solutions:

[0009] A positioning tool for hot shaping of mica capacitor insulating paper, comprising a horizontal bottom plate, an inner core column and an outer mold plate mounted on the bottom plate, the horizontal cross section of the inner core column is rectangular or similar rectangular, the inner wall of the outer mold plate is hollow and open at both ends, the horizontal shape of the inner wall of the outer mold plate is the same as the horizontal shape of the outer wall of the inner core column, the outer mold plate surrounds the inner core column, and the annular gap for placing the insulating paper of the mica capacitor is formed between the outer wall of the inner core column and the inner wall of the outer mold plate. The above-mentioned similar rectangular shape is similar to a standard rectangular shape, such as a rectangular shape with four arc-shaped corners and straight lines for length and width, or a rectangular shape with a certain arc for length and width, etc., and the present application is the former.

[0010] As a preferred, in order to facilitate the realization of the size of the annular gap adjustable function to meet the different size capacitor core epoxy resin filling needs, the outer mold plate includes four transverse section of "L" shaped "L" shaped template, four said "L" shaped template together around into the hollow rectangular shape or similar rectangular shape and with the rectangular shape or similar rectangular shape of the transverse length direction for X, transverse width direction for Y, four said "L" shaped template can be moved and fixed in X and Y direction, or, at least three said "L" shaped template can be moved and fixed in X or Y direction.

[0011] As a preferred, in order to facilitate the realization of the size of the annular gap by moving three "L" shaped template for the purpose of quickly changing, at least three said "L" shaped template can be moved and fixed in X or Y direction, the lower end of the first said "L" shaped template is installed on the bottom plate through the fixed mounting plate, the side of the second said "L" shaped template and the side of the third said "L" shaped template are close to the two sides of the first said "L" shaped template respectively, the other side of the second said "L" shaped template and the other side of the third said "L" shaped template are close to the two sides of the fourth said "L" shaped template respectively, the upper surface of the bottom plate is installed with positioning fixed plate at the position close to the outer side of the second said "L" shaped template and the outer side of the third said "L" shaped template respectively, the outer wall of the second said "L" shaped template and the outer wall of the third said "L" shaped template are respectively provided with positioning moving plate, two said positioning moving plates are connected with two said positioning fixed plates respectively and can be moved and fixed in X or Y direction, the moving direction of two said positioning moving plates is perpendicular to each other, the outer wall of the second said "L" shaped template close to the fourth said "L" shaped template and the outer wall of the third said "L" shaped template close to the fourth said "L" shaped template are connected with one end of the transverse positioning strip through the transverse first positioning screw respectively, the positioning strip is provided with transverse strip-shaped through hole, two transverse second positioning screws are connected with the corresponding outer wall of the fourth said "L" shaped template through the positioning through hole of two said positioning strips respectively after passing through.

[0012] As a preferred, in order to guide the moving direction of the positioning moving plate and quickly complete the relative movement and fixation between the positioning moving plate and the positioning fixed plate, the positioning fixed plate is provided with guiding groove with length direction of X or Y direction, the positioning moving plate is provided with guiding strip, the guiding strip is located in the corresponding guiding groove and can slide, the positioning fixed plate is provided with a plurality of fixed plate pin holes distributed along X or Y direction, the positioning moving plate is provided with a plurality of moving plate pin holes distributed along X or Y direction, the vertical positioning pin passes through one of said moving plate pin holes and one of said fixed plate pin holes.

[0013] As preferred, in order to facilitate the fourth "L" shaped template for handheld moving operation, the fourth "L" shaped template outer wall is provided with a handle.

[0014] As preferred, in order to facilitate the fourth "L" shaped template for handheld moving operation, the fourth "L" shaped template outer wall is provided with a handle.

[0015] The beneficial effects of the utility model lie in:

[0016] The utility model discloses a positioning tool for mica capacitor insulation paper heat setting processing, which comprises a bottom plate, an inner core column and an outer template, wherein the inner core column is arranged on the bottom plate, the outer template is arranged on the outer wall of the inner core column, and an annular gap is formed between the outer wall of the inner core column and the inner wall of the outer template. When in use, the insulation paper of the mica capacitor is placed in the annular gap, so that the inner and outer sides of the insulation paper are both limited and form a cuboid shape. Then, the positioning tool is placed in an oven for heat setting processing. After the processing is completed, the insulation paper is taken out, which has a cuboid shape consistent with the shape of the capacitor core and slightly larger in size. After the insulation paper with the shape is placed in the interlayer space between the mold and the capacitor core, the insulation paper can be located in the middle of the interlayer space and does not contact the inner wall of the mold and the outer wall of the capacitor core. Finally, the purpose of the inner and outer sides of the insulation paper being covered with the epoxy resin with uniform thickness after the epoxy resin is poured is achieved, the phenomenon of paper leakage is avoided, and there is no supporting point. Moreover, the joint of the insulation paper has high adhesion, the insulation performance and crack resistance of the mica capacitor with the epoxy resin pouring layer as the shell are significantly improved, and the quality and service life of the product are improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is one of the perspective views of the positioning tool for mica capacitor insulation paper heat setting processing according to the utility model;

[0018] Figure 2 is the second perspective view of the positioning tool for mica capacitor insulation paper heat setting processing according to the utility model, which is different from the perspective view of Figure 1 ;

[0019] Figure 3 is the top view of the positioning tool for mica capacitor insulation paper heat setting processing according to the utility model after the bottom plate is removed;

[0020] Figure 4 is the top view of the insulation paper processed by the positioning tool for mica capacitor insulation paper heat setting processing according to the utility model. DETAILED DESCRIPTION

[0021] The utility model will be further described in combination with the drawings:

[0022] AsFigures 1-3 As shown, the positioning fixture for heat-setting the insulating paper of mica capacitors according to this utility model includes a horizontal base plate 1 and an inner core column 7 and an outer template (refer to the four "L"-shaped templates 6 below) mounted on the base plate 1. The inner core column 7, which has the same shape as the core of the mica capacitor (not shown in the figure) but is larger in size, has a rectangular or similar rectangular cross-section. The inner wall of the outer template, which is hollow and open at both ends, has the same horizontal shape as the outer wall of the inner core column 7. The outer template surrounds the inner core column 7, and an insulating paper for placing the mica capacitor is formed between the outer wall of the inner core column 7 and the inner wall of the outer template (refer to the four "L"-shaped templates 6 below). Figure 4 The annular gap 15 of the ring-shaped insulating paper 16 after shaping. The above-mentioned similar rectangle is a shape similar to a standard rectangle, such as a rectangle with rounded corners and straight length and width, or a rectangle with a certain curvature in length and width, etc. This utility model is the former.

[0023] like Figures 1-3 As shown, this utility model also discloses the following more optimized specific structures:

[0024] To facilitate the adjustment of the size of the annular gap 15 to meet the epoxy resin potting requirements of capacitor cores of different sizes, the outer template includes four L-shaped templates 6 with an L-shaped cross section. The four L-shaped templates 6 together form a hollow cuboid shape or a similar cuboid shape, with the horizontal length direction of the cuboid shape or similar cuboid shape as the X direction and the horizontal width direction as the Y direction. All four L-shaped templates 6 can move and be fixed in the X and Y directions, or at least three L-shaped templates 6 can move and be fixed in either the X or Y direction.

[0025] To facilitate rapid changes in the size of the annular gap 15 by moving the three "L"-shaped templates 6, at least three "L"-shaped templates 6 are movable and fixed in the X or Y direction. The lower end of the first "L"-shaped template 6 is mounted on the base plate 1 via a fixed mounting plate 12. One side of the second and third "L"-shaped templates 6 are close to the two sides of the first "L"-shaped template 6, respectively. The other side of the second and third "L"-shaped templates 6 are close to the two sides of the fourth "L"-shaped template 6, respectively. The top of the base plate 1 is positioned at the outer edges of the second and third "L"-shaped templates 6 near the first "L"-shaped template 6, respectively. The outer walls of the second and third "L"-shaped templates 6 are respectively equipped with positioning and fixing plates 2, positioning and moving plates 13, and positioning and moving plates 13 are respectively connected to the two positioning and fixing plates 2 and can move and be fixed in the X or Y direction. The moving directions of the two positioning and moving plates 13 are perpendicular to each other. The outer walls of the second and third "L"-shaped templates 6 near the fourth "L"-shaped template 6 are respectively connected to one end of the horizontal positioning strip 5 through the first horizontal positioning screw 3. The positioning strip 5 is provided with a horizontal strip-shaped through hole (not marked in the figure). The two horizontal second positioning screws 4 pass through the positioning through holes of the two positioning strips 5 and are connected to the corresponding outer walls of the fourth "L"-shaped template 6.

[0026] In order to guide the movement direction of the positioning moving plate 13 and quickly complete the relative movement and fixation between the positioning moving plate 13 and the positioning fixed plate 2, the positioning fixed plate 2 is provided with a guide groove 11 in the X or Y direction of length, the positioning moving plate 13 is provided with a guide strip 14, the guide strip 14 is located in the corresponding guide groove 11 and can slide, the positioning fixed plate 2 is provided with a plurality of fixed plate pin holes 10 distributed along the X or Y direction, the positioning moving plate 13 is provided with a plurality of moving plate pin holes (not visible in the figure) distributed along the X or Y direction, and a vertical positioning pin (not shown in the figure) passes through one of the moving plate pin holes and one of the fixed plate pin holes 10 to fix the positioning moving plate 13 and the positioning fixed plate 2.

[0027] To facilitate the movement of the fourth "L"-shaped template 6 by hand, a handle 9 is provided on the outer wall of the fourth "L"-shaped template 6.

[0028] To facilitate the handling of insulating paper ( Figures 1-3 (Not shown) guides it to insert it more smoothly into the annular slit 15. The upper inner wall surface of the "L"-shaped template 6 is a slope 8 and the upper end of the slope 8 is located on the lateral outside of the lower end.

[0029] like Figures 1-3As shown, during use, first, the unprocessed planar insulation paper (not shown in the figure) is inserted from the upper end of the annular gap 15. During the insertion process, the insulation paper is first wrapped around the inner core column 7 to form an oval shape, but the insulation paper cannot be bent to create a crease. Then, the outer wall of the insulation paper is moderately extruded to be located at the upper end of the annular slope formed by the plurality of slopes 8. Then, the insulation paper is slowly pushed from top to bottom. Under the guidance of the annular slope, the insulation paper will gradually slide into the annular gap 15, and the shape of the insulation paper will also adaptively change to the shape of the annular gap 15. During this process, the joint of the insulation paper is located in the middle of the wider flat layer of the annular gap 15, so that the joint of the insulation paper is highly fitted. After the insulation paper is completely inserted into the annular gap 15, the entire positioning tool is placed in an oven. After a certain period of heat setting processing, the insulation paper that has been set is removed, and a ring-shaped insulation paper 16 in a similar cuboid shape consistent with the shape of the annular gap 15 is obtained, as shown. Since the ring-shaped insulation paper 16 is consistent with the shape of the core of the mica capacitor and the shape of the mold for pouring epoxy resin, the ring-shaped insulation paper 16 can be located in the middle of the interlayer space between the mold and the capacitor core without contacting the inner wall of the mold and the outer wall of the capacitor core. Finally, in the mica capacitor after pouring the epoxy resin, the ring-shaped insulation paper 16 has the purpose of being covered with uniform thickness of epoxy resin on both the inner and outer sides. Figure 4

[0030] When different sizes of insulation paper for mica capacitors need to be heat set, first, the inner core column of different sizes needs to be replaced, and then the positions of the second, third, and fourth "L" shaped templates 6 in the X direction or Y direction are adjusted and fixed. Among them, the second and third "L" shaped templates 6 need to be removed first, then the corresponding "L" shaped template 6 is moved, and then the positioning pin is inserted. The fourth "L" shaped template 6 needs to be loosened first, then the fourth "L" shaped template 6 is moved, and then the second positioning screw 4 is tightened. Finally, the size of the annular gap 15 meets the application requirements, and the above process can be repeated.

[0031] If multiple pieces of insulation paper need to be heat set at one time, the width of the annular gap 15 needs to be increased, and then multiple pieces of insulation paper are inserted into the annular gap 15, and the above process can be repeated.

[0032] ​Illustration: In the above structure, the connecting mode between the inner core column 7 and the bottom plate 1 is not limited, and according to actual needs, specific connecting modes such as screw connection, pin connection, etc. can be adopted, and the connecting position is preferably within the range of the lower end face of the inner core column 7. Specifically, a vertical through hole can be provided on the middle part of the inner core column 7, a protruding connecting part is provided on the lower end hole wall of the vertical through hole, a vertical connecting through hole is provided on the connecting part, a connecting screw passes through the connecting through hole and is connected with the screw hole on the bottom plate 1, and screw connection between the inner core column 7 and the bottom plate 1 can be achieved. Since various connecting structures can be adopted between the inner core column 7 and the bottom plate 1, the connecting structure is not specifically shown in the drawings, but can be easily realized according to the prior art.

[0033] The above embodiments are only preferred embodiments of the present application, and are not a limitation on the technical solutions of the present application. Any technical solution that can be realized on the basis of the above embodiments without creative labor shall be considered to fall within the protection scope of the patent of the present application.

Claims

1. A positioning tool for heat setting process of mica capacitor insulation paper, comprising a transverse bottom plate, characterized in that: The inner core column and the outer mold plate are installed on the bottom plate, the transverse section of the inner core column is rectangular or similar rectangular, the outer shape of the inner core column is consistent with the core shape of the mica capacitor, the inner wall of the outer mold plate is hollow and open at both ends, the transverse shape of the inner wall of the outer mold plate is the same as the transverse shape of the outer wall of the inner core column, the outer mold plate surrounds the inner core column, and the annular gap for placing the insulating paper of the mica capacitor is formed between the outer wall of the inner core column and the inner wall of the outer mold plate.

2. The positioning tool for heat setting process of mica capacitor insulation paper according to claim 1, characterized in that: The outer mold plate comprises four "L" shaped mold plates with "L" shaped transverse sections, four "L" shaped mold plates are collectively surrounded to form a hollow cuboid shape or similar cuboid shape, and the transverse length direction of the cuboid shape or similar cuboid shape is X direction and the transverse width direction is Y direction, four "L" shaped mold plates can move and fix in X direction and Y direction, or at least three "L" shaped mold plates can move and fix in X direction or Y direction.

3. The positioning tool for heat setting process of mica capacitor insulation paper according to claim 2, characterized in that: At least three "L" shaped mold plates can move and fix in X direction or Y direction, the lower end of the first "L" shaped mold plate is installed on the bottom plate through the fixed mounting plate, one side of the second "L" shaped mold plate and one side of the third "L" shaped mold plate are close to two sides of the first "L" shaped mold plate respectively, the other side of the second "L" shaped mold plate and the other side of the third "L" shaped mold plate are close to two sides of the fourth "L" shaped mold plate respectively, the upper surface of the bottom plate is installed with positioning fixed plates at positions close to the outer side of the first "L" shaped mold plate in the second "L" shaped mold plate and the outer side of the first "L" shaped mold plate in the third "L" shaped mold plate respectively, the outer wall of the second "L" shaped mold plate and the outer wall of the third "L" shaped mold plate are respectively provided with positioning moving plates, two positioning moving plates are connected with two positioning fixed plates respectively and can move and fix in X direction or Y direction, the moving directions of two positioning moving plates are perpendicular to each other, the outer wall of the second "L" shaped mold plate close to the fourth "L" shaped mold plate and the outer wall of the third "L" shaped mold plate close to the fourth "L" shaped mold plate are connected with one end of the transverse positioning strip through the transverse first positioning screw respectively, the positioning strip is provided with the transverse strip-shaped through hole, and two transverse second positioning screws are connected with the corresponding outer wall of the fourth "L" shaped mold plate after penetrating through the positioning through holes of two positioning strips respectively.

4. The positioning tool for heat setting process of mica capacitor insulation paper according to claim 3, characterized in that: The positioning fixed plate is provided with the guide groove with X direction or Y direction as the length direction, the positioning moving plate is provided with the guide strip, the guide strip is located in the corresponding guide groove and can slide, the positioning fixed plate is provided with a plurality of fixed plate pin holes distributed along X direction or Y direction, the positioning moving plate is provided with a plurality of moving plate pin holes distributed along X direction or Y direction, and the vertical positioning pin penetrates through one of the moving plate pin holes and one of the fixed plate pin holes.

5. The positioning tool for heat setting process of mica capacitor insulation paper according to claim 2 or 3, characterized in that: The outer wall of the fourth "L" shaped mold plate is provided with a handle.

6. The positioning tool for heat setting process of mica capacitor insulation paper according to any one of claims 2-4, characterized in that: The upper inner wall surface of the "L" shaped mold plate is inclined, and the upper end of the inclined surface is located on the transverse outer side of the lower end.

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