Pouring mold of dry-type transformer with air passage

Abstract

The utility model discloses a pouring mold of a dry-type transformer with an air passage, and belongs to the technical field of transformers. Comprising a forming die base, an outer forming die, an inner forming die, a pressing plate, a plurality of air hole strips and four screws. Square holes are formed in the middles of the upper side and the lower side of the forming inner mold. Two hanging rings are arranged at the two ends of a long shaft on the upper side. The shape of the long circular plate is matched with that of the forming inner mold, the square column is arranged in the middle of the lower side of the long circular plate and matched with the square hole, the four pressing arms are arranged on the lower side of the long circular plate, V-shaped notches capable of containing the hanging rings are formed in the two ends of a long shaft of the long circular plate and located at the two hanging rings, and the square column is vertically arranged and embedded into the square hole. The hanging rings are located in the V-shaped notches in the corresponding ends, the center lines of the V-shaped notches coincide with the long axis of the long circular plate, the two ends of the long axis of the long circular plate are each provided with two pressing arms, and the two pressing arms at the same end are arranged along the two edges of the V-shaped notches on the same side respectively. The pressing arm is provided with a through hole allowing one air hole strip at the corresponding position of different layers to penetrate through at the same time.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformers, and in particular relates to a casting mold of a dry-type transformer with an air channel. Background Art

[0002] Low-voltage coils for dry-type transformers are typically wound with copper foil or copper wire. However, the unique environmental conditions in some regions require the coils to be cast with resin, where the copper foil or copper wire is wrapped with resin. To prevent resin leakage and contamination of the work environment, a suitable mold must be used during the casting process.

[0003] For example, the patent with application number CN202121076516.6 discloses a casting mold for dry-change production with reserved positions for clamps and pads, comprising a base, a mold body and a pressing part, the mold body being arranged on the base, and the pressing part being located on the side of the mold body facing away from the base; a plurality of clamp and pad installation areas are formed on the side of the mold body facing the pressing part, and a plurality of air duct holes are opened on the side of the mold body facing the pressing part; each of the air duct holes is located outside the vertical projection area of ​​the pressing part on the mold body, and each of the clamp and pad installation areas is located within the vertical projection area of ​​the pressing part on the mold body.

[0004] For example, the patent with application number CN202310255885.9 discloses a winding mold, including: an upper positioning plate, a lower positioning plate, an inner mold, two transmission disks and a plurality of connecting support plates; the upper positioning plate and the lower positioning plate are hollow rings, the inner diameters of the upper positioning plate and the lower positioning plate match the outer diameter of the inner mold, the upper positioning plate is sleeved on the upper end portion of the inner mold, and the lower positioning plate is sleeved on the lower end portion of the inner mold; the outer diameters of the two transmission disks match the inner diameters of the upper positioning plate and the lower positioning plate, the two transmission disks are respectively embedded in the upper positioning plate and the lower positioning plate, and the two transmission disks are fixedly connected to the upper positioning plate and the lower positioning plate through the plurality of connecting support plates; the winding mold is used to wind the wire, and the wire is wound on the inner mold.

[0005] For example, the patent with application number CN202111214931.8 discloses a dry-type transformer winding casting mold, which includes a steel inner mold and a mirror stainless steel outer mold. The steel inner mold is a cylinder with the same mold body diameter, and the inner side of the steel inner mold is fixedly connected with a limit bar for fixing the shape of the steel inner mold; the rear end of the mirror stainless steel outer mold is provided with a panel for shaping and positioning the high-voltage outlet head, and the panel is clamped by a C-type clamp; a high-voltage baffle is installed above the winding for fixing the radial distance between the steel inner mold and the mirror stainless steel outer mold; the dry-type transformer winding casting mold is detachably fixed to the upper end of the base plate.

[0006] For example, the patent with application number CN202310003046.8 discloses a dry-type transformer coil forming mold, including a forming mold base, a forming outer mold, a forming inner mold and an arc-shaped cooling plate for forming a heat dissipation air duct; the forming outer mold has an outer mold cavity that passes through the upper and lower end surfaces; the forming inner mold includes an inner mold cylinder, a lower mold plate sleeved on the lower end of the inner mold cylinder and an upper mold plate sleeved on the upper end of the inner mold cylinder; the upper mold plate separates the outer mold cavity and has an upper positioning groove for inserting the arc-shaped cooling plate; the lower mold plate separates the outer mold cavity and has a lower positioning groove for inserting the arc-shaped cooling plate; the forming mold base includes a mold base plate, a locking column installed on the mold base plate, and a locking component installed on the locking column and used to press the forming outer mold and the forming inner mold against the mold base plate.

[0007] It can be seen from the above patents that the existing casting mold includes a forming mold base, a forming outer mold, a forming inner mold, a pressure plate, multiple air pore strips and four screws, etc. The forming outer mold and the forming inner mold surround an oblong mold cavity. Square holes are provided in the middle of the upper and lower sides of the forming inner mold (to match the rotating shaft on the winding equipment), and two hanging rings are provided at both ends of the long axis on its upper side. The pressure plate presses on the upper side of the forming inner mold, which is usually X-shaped, and its four pressure arms extend outward relative to the forming outer mold. Four screws are arranged around the forming outer mold, and they are arranged vertically, and are respectively arranged between the forming mold base and the outer ends of the four pressure arms. The air pore strips are located in the mold cavity and are arranged in multiple layers around the forming inner mold. The upper ends of the air pore strips extend upward relative to the forming inner mold.

[0008] The applicant discovered the following problems when using the existing mold:

[0009] (1) For the pressure arm, the prior art usually does not set the air hole strips or avoids setting the air hole strips, which will reduce the number of air hole strips.

[0010] (2) During casting, a large number of molds are usually automatically cast in a vacuum device. The resin may enter the square holes or hollow holes of the inner mold, which will not only make the mold dirty, but also affect the use of the mold (for example, if the resin enters the square hole, it will not be able to pass through the corresponding rotating shaft during winding). Utility Model Content

[0011] To address the above-mentioned issues, the present invention provides a casting mold for a dry-type transformer with an air channel. An oblong plate is provided to shield the pore structure on the inner mold, preventing resin from entering the pore structure. The air pore strips can pass through the pressure arm, ensuring the number of air pore strips. The technical solution is as follows:

[0012] The embodiment of the present invention provides a casting mold for a dry-type transformer with an air channel, comprising a forming mold base 1, a forming outer mold 2, a forming inner mold 3, a pressing plate 5, a plurality of air hole strips 4 and four screws 6, wherein the forming outer mold 2 and the forming inner mold 3 surround an oblong mold cavity; a square hole 31 is provided in the middle of the upper and lower sides of the forming inner mold 3, and two hanging rings 32 are provided at both ends of the long axis of the upper side; the pressing plate 5 is pressed on the upper side of the forming inner mold 3 and its four pressing arms 53 extend outward relative to the forming outer mold 2; four screws 6 are arranged around the forming outer mold 2, and are arranged vertically, and are respectively arranged between the forming mold base 1 and the outer ends of the four pressing arms 53; the air hole strips 4 are located in the mold cavity and are arranged in multiple layers around the forming inner mold 3, and the upper ends of the air hole strips 4 extend upward relative to the forming inner mold 3; The pressing plate 5 includes an oblong plate 51 that matches the shape of the forming inner mold 3, a square column 52 in the middle of the lower side of the oblong plate 51 and matching the square hole 31, and four pressing arms 53 on the lower side of the oblong plate 51. V-shaped notches 54 that can accommodate the hanging rings 32 are provided at both ends of the long axis of the oblong plate 51 and located at the two hanging rings 32. The square column 52 is arranged vertically and embedded in the square hole 31. The hanging ring 32 is located in the V-shaped notch 54 at the corresponding end. The center line of the V-shaped notch 54 coincides with the long axis of the oblong plate 51. Two pressing arms 53 are provided at each end of the long axis of the oblong plate 51. The two pressing arms 53 at the same end are respectively arranged along the two sides of the V-shaped notch 54 on the same side; the pressing arm 53 is provided with a through hole 56 for a pore strip 4 at the corresponding position of different layers to pass through at the same time.

[0013] Furthermore, two hollow holes 33 are provided side by side on the upper side of the forming inner mold 3 in the embodiment of the present invention; the two hollow holes 33 are perpendicular to the long axis of the forming inner mold 3, and are respectively located on both sides of the square hole 31, and are located between the square hole 31 and the hanging ring 32 on the corresponding side; the oblong plate 51 covers the hollow holes 33.

[0014] Specifically, the pore strips 4 of different layers at the pressure arm 53 in the embodiment of the present invention are arranged side by side in the direction where the pressure arm 53 is located.

[0015] Among them, the pressure arm 53 in the embodiment of the present invention is a square tube, with multiple lower through holes arranged side by side on its lower side, and an upper strip hole provided on its upper side along its direction; the upper strip hole is located between the inner side of the screw 6 and the outer edge of the oblong plate 51; the different layers of the pore strips 4 at the pressure arm 53 pass through different lower through holes respectively, and pass through the upper strip hole together.

[0016] Specifically, in the embodiment of the present invention, the plurality of air hole strips 4 are arranged in two layers around the inner forming mold 3 , and two lower through holes are provided side by side on the lower side of the pressing arm 53 .

[0017] Specifically, in the embodiment of the present invention, the air hole strips 4 are not provided in the area within the mold cavity and near the copper bar 7, and the air hole strips 4 are arranged in an arc shape, and the two pressure arms 53 near the copper bar 7 are respectively located on both sides of the copper bar 7 and at the air hole strips 4 at both ends of the arc.

[0018] Furthermore, a center hole 55 is provided at the center of the oblong plate 51 in the embodiment of the present invention and directly above the square column 52 .

[0019] Furthermore, the inner ends of the two pressure arms 53 at the same end in the embodiment of the present invention are welded together to form a V-shaped structure, and the two V-shaped structures are respectively located on both sides of the square column 52 and are welded and fixed to the lower side of the oblong plate 51; the opening angle of the V-shaped notch 54 is 110-145°, and accordingly, the opening angle of the V-shaped structure is 110-145°.

[0020] The square column 52 in the embodiment of the present invention is a square tube structure, which is clearance-matched with the square hole 31 .

[0021] Preferably, the pressing plate 5 in the embodiment of the present invention is symmetrically arranged with respect to the long axis of the inner forming mold 3 and symmetrically arranged with respect to the short axis of the inner forming mold 3 .

[0022] The technical solution provided by the present invention provides the following beneficial effects: The present invention provides a casting mold for a dry-type transformer with an air duct. An oblong plate (also used to secure the pressure arm) shields the pore structure of the inner mold, preventing resin from entering the pore structure. The air pore strips can pass through the pressure arm, ensuring the number of air pore strips. This facilitates assembly of the pressure plate, with the square post nestled within the square hole for positioning and securing. The assembly is more stable, with the square post nestled within the square hole and four screws securing the pressure plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of an existing forming inner mold;

[0024] Figure 2 Schematic diagram of a casting mold for a dry-type transformer with an air duct provided by an embodiment of the present utility model;

[0025] Figure 3 is a top view of the pressure plate;

[0026] Figure 4 This is a bottom view of the pressure plate.

[0027] In the figure: 1 forming die base, 2 forming outer die, 3 forming inner die, 4 air hole strip, 5 pressing plate, 6 screw, 7 copper bar;

[0028] 31 square hole, 32 hanging ring, 33 hollow hole;

[0029] 51 oblong plate, 52 square column, 53 pressure arm, 54 V-shaped notch, 55 center hole, 56 through hole. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0031] Example 1

[0032] See also Figure 1-4 Example 1 provides a casting mold for a dry-type transformer with an air duct, comprising a molding die base 1, an outer molding die 2, an inner molding die 3, a pressing plate 5, a plurality of air hole strips 4, and four screws 6. The outer molding die 2 and the inner molding die 3 enclose an oblong mold cavity. Both the outer molding die 2 and the inner molding die 3 are located on the upper side of the molding die base 1 and are both oblong cylindrical structures. The outer molding die 2 is located outside the inner molding die 3, with one end of its long axis disconnected and secured by multiple C-shaped clips (arranged side by side in an upper and lower arrangement). The inner molding die 3 has square holes 31 in the middle of both the upper and lower sides, two hanging rings 32 at both ends of its long axis, and two hollow holes 33 (to reduce weight and facilitate operation) are arranged side by side in an upper side. The two hollow holes 33 (specifically, strip-shaped holes) are perpendicular to the long axis of the inner molding die 3 and are located on either side of the square hole 31, respectively, and between the square hole 31 and the hanging ring 32 on the corresponding side. Four screws 6 are arranged vertically around the outer mold 2 and secured (via nuts) between the mold base 1 and the outer ends of the four pressure arms 53. Air strips 4 are positioned within the mold cavity and arranged in multiple layers around the inner mold 3. The upper ends of the air strips 4 extend upward relative to the inner mold 3 and are defined by through-holes.

[0033] The pressure plate 5 presses against the upper side of the inner mold 3 and comprises an oblong plate 51 that matches the shape of the inner mold 3, a square post 52 in the middle of the lower side of the oblong plate 51 that mates with the square hole 31, and four pressure arms 53 on the lower side of the oblong plate 51. The oblong plate 51 is oblong and smaller than the inner mold 3. It is parallel to the corresponding sides of the inner mold 3, with a distance of 2.0-3.5 cm between them. V-shaped notches 54 are provided at both ends of its long axis, located at the two hanging rings 32, to accommodate the hanging rings 32 and conceal the hollow holes 33. The square post 52 is vertically arranged and embedded in the square hole 31 to seal it. Specifically, it is a square tube structure with a clearance fit within the square hole 31. Its length (greater than the thickness of the pressure arm 53) is 5-10 cm. The hanging ring 32 is located in the V-shaped notch 54 at the corresponding end. The two V-shaped notches 54 are arranged back-to-back, with the midline of the V-shaped notches 54 coinciding with the long axis of the oblong plate 51. Two pressure arms 53 are positioned at each end of the long axis of the oblong plate 51. The two pressure arms 53 on the same end are positioned along the two edges of the V-shaped notch 54 on the same side, forming a V-shaped or figure-eight arrangement. The lower side of the pressure arm 53 presses against the upper side of the inner forming mold 3. The pressure arm 53 extends outward relative to the outer forming mold 2 and is provided with a through hole 56 through which a single air vent strip 4 at a corresponding position on each layer passes. Accordingly, the air vent strip 4 at the corresponding position passes through the through hole 56 (including the lower through hole and the upper strip-shaped hole).

[0034] Specifically, the pore strips 4 of different layers at the pressure arm 53 in the embodiment of the present invention are arranged side by side in the direction where the pressure arm 53 is located.

[0035] The pressure arm 53 in the embodiment of the present invention is a square tube with multiple lower through holes arranged side by side on its lower side (specifically, arranged perpendicular to the direction of the pressure arm 53, and the multiple lower through holes are arranged side by side in the direction of the pressure arm 53, and are specifically rectangular holes). An upper strip hole is provided on its upper side along the direction of the pressure arm 53. The number of lower through holes is equal to the number of air hole strips 4 at the corresponding pressure arm 53. The upper strip hole is located between the inner side of the screw 6 and the outer edge of the oblong plate 51. The air hole strips 4 of different layers on the pressure arm 53 pass through different lower through holes respectively, and all pass through the upper strip hole together.

[0036] Specifically, in the embodiment of the present invention, the air hole strips 4 are not provided in the area within the mold cavity and near the copper bar 7, and the air hole strips 4 are arranged in an arc (broken at the copper bar 7), and the two pressure arms 53 near the copper bar 7 are respectively located on both sides of the copper bar 7 and at the air hole strips 4 at both ends of the arc.

[0037] Furthermore, in the embodiment of the present invention, a central hole 55 (smaller (less than 2 cm in diameter) as a backup to prevent resin from entering) is provided at the center of the oblong plate 51 and directly above the square column 52 .

[0038] Preferably, the pressing plate 5 in the embodiment of the present invention is symmetrically arranged with respect to the long axis of the inner forming mold 3 and symmetrically arranged with respect to the short axis of the inner forming mold 3 .

[0039] Example 2

[0040] See also Figure 1-4 Example 2 provides a casting mold for a dry-type transformer with an air duct, and its structure is basically the same as that of Example 1, except that: in this embodiment, multiple air hole strips 4 are arranged in two layers around the forming inner mold 3, and two lower through holes are arranged side by side on the lower side of the pressure arm 53.

[0041] Example 3

[0042] Example 3 provides a casting mold for a dry-type transformer with an air duct. Its structure is essentially the same as that of Example 1, except that the inner ends of two pressure arms 53 at the same end are welded together to form a V-shaped structure. The two V-shaped structures are located on either side of the square column 52 and welded to the underside of the oblong plate 51. The opening angle of the V-shaped notch 54 is 110-145°, and accordingly, the opening angle of the V-shaped structure is also 110-145°.

[0043] Example 4

[0044] Example 4 provides a casting mold for a dry-type transformer with an air duct. Its structure is essentially the same as that of Example 1, except that: in this embodiment, the outer mold 2 and inner mold 3 are both arranged in the front-to-back direction, no air hole strip 4 is provided at the front end of the mold cavity, and two hollow holes 33 are arranged side by side in front and behind the square hole 31, respectively. The oblong plate 51 is arranged in the front-to-back direction, with V-shaped notches 54 provided at both its front and rear ends. The V-shaped notches 54 are arranged in the front-to-back direction and have an opening angle of 120°.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A casting mold for a dry-type transformer with an air channel, comprising a molding die base (1), a molding outer die (2), a molding inner die (3), a pressure plate (5), a plurality of air hole strips (4) and four screw rods (6), wherein the molding outer die (2) and the molding inner die (3) surround an oblong mold cavity; the molding inner die (3) is provided with square holes (31) in the middle of both upper and lower sides, and two suspension rings (32) are provided at both ends of the long axis of the upper side; the pressure plate (5) presses on the upper side of the molding inner die (3) and its four pressure arms (53) extend outward relative to the molding outer die (2); four screw rods (6) are arranged around the molding outer die (2), and are arranged vertically, and are respectively arranged between the molding die base (1) and the outer ends of the four pressure arms (53); the air hole strips (4) are located in the mold cavity and are arranged in multiple layers around the molding inner die (3), and the upper ends of the air hole strips (4) extend upward relative to the molding inner die (3); it is characterized in that The pressing plate (5) comprises an oblong plate (51) that matches the shape of the inner forming mold (3), a square column (52) in the middle of the lower side of the oblong plate (51) and matched with the square hole (31), and four pressing arms (53) on the lower side of the oblong plate (51). V-shaped notches (54) capable of accommodating the hanging rings (32) are provided at both ends of the long axis of the oblong plate (51) and at the two hanging rings (32). The square column (52) is vertically arranged and embedded in the square hole (31). ), the hanging ring (32) is located in the V-shaped notch (54) at the corresponding end, the center line of the V-shaped notch (54) coincides with the long axis of the oblong plate (51), and two pressure arms (53) are respectively provided at both ends of the long axis of the oblong plate (51), and the two pressure arms (53) at the same end are respectively provided along the two sides of the V-shaped notch (54) on the same side; the pressure arm (53) is provided with a through hole (56) for a pore strip (4) at a corresponding position of different layers to pass through at the same time.

2. The casting mold of the dry-type transformer with air duct according to claim 1, characterized in that: Two hollow holes (33) are arranged side by side on the upper side of the inner forming mold (3); the two hollow holes (33) are perpendicular to the long axis of the inner forming mold (3), and are respectively located on both sides of the square hole (31), and are located between the square hole (31) and the hanging ring (32) on the corresponding side; the oblong plate (51) covers the hollow holes (33).

3. The casting mold of the dry-type transformer with air duct according to claim 1, characterized in that: The air hole strips (4) of different layers at the pressing arm (53) are arranged side by side in the direction where the pressing arm (53) is located.

4. The casting mold of the dry-type transformer with air duct according to claim 3, characterized in that: The pressure arm (53) is a square tube, with a plurality of lower through holes arranged side by side on its lower side, and an upper strip hole provided along its upper side; the upper strip hole is located between the inner side of the screw (6) and the outer edge of the oblong plate (51); the pore strips (4) of different layers at the pressure arm (53) pass through different lower through holes respectively, and pass through the upper strip hole together.

5. The casting mold of the dry-type transformer with air duct according to claim 4, characterized in that: A plurality of air hole strips (4) are arranged in two layers around the inner forming mold (3), and two lower through holes are arranged side by side on the lower side of the pressing arm (53).

6. The casting mold of the dry-type transformer with air duct according to claim 1, characterized in that: No pore strips (4) are provided in the area within the mold cavity and close to the copper bar (7), and the pore strips (4) are arranged in an arc shape, and the two pressure arms (53) close to the copper bar (7) are respectively located on both sides of the copper bar (7) and at the pore strips (4) at both ends of the arc.

7. The casting mold of the dry-type transformer with air duct according to claim 1, characterized in that: A central hole (55) is provided at the center of the oblong plate (51) and directly above the square column (52).

8. The casting mold of the dry-type transformer with air duct according to claim 1, characterized in that: The inner ends of the two pressure arms (53) at the same end are welded together to form a V-shaped structure. The two V-shaped structures are respectively located on both sides of the square column (52) and are welded and fixed to the lower side of the oblong plate (51). The opening angle of the V-shaped notch (54) is 110-145°. Accordingly, the opening angle of the V-shaped structure is 110-145°.

9. The casting mold of the dry-type transformer with air duct according to claim 1, characterized in that: The square column (52) is a square tube structure, which is clearance-matched with the square hole (31).

10. The casting mold of the dry-type transformer with air duct according to claim 1, characterized in that: The pressing plate (5) is symmetrically arranged with respect to the long axis of the forming inner mold (3) and is symmetrically arranged with respect to the short axis of the forming inner mold (3).

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