An ultra-high voltage insulator encapsulation injection mold

Abstract

The utility model discloses an extra -high voltage insulator rubber coating injection mold, including lower mould, upper die and the insulator core rod clamped between lower mould and upper die, its characterized in that: the opposite pressure joint surface of lower mould and upper die all are equipped with the cavity, and the cavity periphery is evenly distributed with several conformal cooling water channels along the circumference, and the both ends of conformal cooling water channel that goes out the mould body all are equipped with cooling pipe interface, the inner wall of cavity is equipped with exhaust groove, and the exhaust groove is equipped with the porous metal exhaust strip in, and exhaust groove is linked through exhaust passage with the vacuum interface of upper die outer wall intercommunication. The utility model discloses the combination design through vacuum interface and porous metal exhaust strip, has realized double exhaust guarantee, and vacuum system actively excludes most air before injecting glue, and porous metal exhaust strip utilizes its micron level intercommunication hole, and allows gas to pass through but can completely block molten rubber in the injection process, has realized anti - jam exhaust, and effectively reduced product bubble and scorch defect.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage electrical equipment manufacturing technology, and in particular to an ultra-high voltage insulator rubber coating injection mold. Background Technology

[0002] Composite insulators are core components of ultra-high voltage transmission lines. They are made by covering a glass fiber reinforced epoxy resin core rod with a silicone rubber shed. Currently, the mainstream manufacturing process is integral injection molding.

[0003] However, in long-term use, existing injection molds have problems. Due to the complex structure of the insulator skirt and the deep and narrow cavity, air is easily trapped at the end of the cavity during injection, forming bubbles or causing the rubber to burn, which seriously damages the insulation performance and mechanical strength of the product. In addition, conventional drilled cooling channels are difficult to fit the complex cavity surface, resulting in low and uneven mold cooling efficiency.

[0004] To address these issues, we propose a special injection mold for overmolding ultra-high voltage insulators. Utility Model Content

[0005] The purpose of this invention is to provide an ultra-high voltage insulator coating injection mold to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A high-voltage insulator coating injection mold includes a lower mold, an upper mold, and an insulator core rod clamped between the lower and upper molds. The mold is characterized in that: the opposing pressing surfaces of the lower and upper molds each have a cavity; a plurality of conformal cooling channels are evenly distributed circumferentially around the cavity; cooling pipe interfaces are installed at both ends of the conformal cooling channels extending out of the mold body; an exhaust groove is formed on the inner wall of the cavity; a perforated metal exhaust strip is installed in the exhaust groove; and the exhaust groove is connected to a vacuum interface located on the outer wall of the upper mold via an exhaust channel.

[0007] In a further embodiment, vertical guide holes are provided at each of the four corners of the lower mold, and a guide rod is connected to each of the four corners of the upper mold corresponding to each guide hole, and the guide rod is used to slide through the guide hole.

[0008] In a further embodiment, the distance between the conformal cooling channel and the inner surface of the cavity remains constant, and the distance ranges from -mm.

[0009] In a further embodiment, the exhaust groove has a length of 1-2 mm, a depth of 0.01-0.03 mm, and a width of 5-10 mm.

[0010] In a further embodiment, the exhaust channels and conformal cooling water channels are arranged alternately.

[0011] In a further embodiment, the porous metal exhaust strip is interference-fitted into the exhaust groove.

[0012] In a further embodiment, the porous metal exhaust strip is made of sintered bronze or stainless steel.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This invention achieves dual venting protection through a combination design of a vacuum interface and a porous metal vent strip. The vacuum system actively removes most of the air before glue injection, while the porous metal vent strip, with its micron-level interconnected pores, allows gas to pass through during glue injection but completely blocks the molten rubber, thus achieving anti-clogging venting and effectively reducing product bubbles and scorching defects.

[0014] This invention achieves rapid and uniform heat dissipation of the mold by maintaining a constant distance between the conformal cooling water channel and the cavity surface, which greatly shortens the vulcanization cooling time and improves production efficiency. At the same time, it effectively avoids problems such as internal stress and warping deformation caused by uneven cooling, and ensures the accuracy of product dimensions and the stability of mechanical strength. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the installation structure of the lower mold and the insulator core rod of this utility model; Figure 3 This is a schematic diagram of the structure of this utility model after partial cross-section; Figure 4 This is a schematic diagram of the upper mold structure of this utility model; Figure 5 This utility model Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0016] In the diagram: 1. Lower mold; 11. Guide hole; 2. Upper mold; 21. Guide rod; 3. Insulator core rod; 4. Cavity; 5. Conformal cooling water channel; 6. Cooling pipe interface; 7. Exhaust groove; 8. Exhaust channel; 9. Vacuum interface; 10. Perforated metal exhaust strip. Detailed Implementation

[0017] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-5 A type of ultra-high voltage insulator coating injection mold mainly consists of a lower mold 1 and an upper mold 2. The insulator core rod 3 to be coated is fixed between the lower mold 1 and the upper mold 2 by clamps at both ends (not shown in the figure).

[0021] When the mold is closed, the guide rods 21 at the four corners of the upper mold 2 are precisely inserted into the guide holes 11 at the four corners of the lower mold 1 to ensure that the cavities 4 of the upper and lower molds are perfectly aligned and the shape of the cavity 4 is consistent with the design of the insulator skirt.

[0022] Around the cavity 4, a conformal cooling channel 5 is processed by 3D printing technology. In this embodiment, the distance between the channel and the surface of the cavity 4 is constantly controlled at 12mm. The two ends of the channel are connected to an external mold temperature controller through a cooling pipe interface 6 to circulate the cooling medium (usually water).

[0023] At the end of the parting surface of the cavity 4, an exhaust groove 7 is provided. In this embodiment, the groove is 1.5 mm long, 0.02 mm deep, and 8 mm wide. A porous metal exhaust strip 10 made of sintered stainless steel is pressed into the groove with an interference fit. The powder particles are fused together, but not completely melted, leaving a large number of randomly distributed, interconnected micropores with an average pore size of 10 µm and a porosity of 30%. This size is much larger than gas molecules, but much smaller than the molecular clusters of molten rubber, thus achieving selective passage. The bottom of the exhaust groove 7 is connected to an exhaust channel 8. The exhaust channel 8 is formed in the same way as the conformal cooling water channel 5. This channel is connected to a vacuum interface 9 provided on the surface of the upper mold 2. The vacuum interface 9 is connected to an external vacuum pump through a pipeline.

[0024] Working principle: During use, the insulator core rod 3 is fixed on the lower mold 1, the equipment is started, and the upper mold 2 closes with the lower mold 1 under the guidance of the guide rod 21. Then, the vacuum pump is started, and the sealed cavity 4 is evacuated through the vacuum interface 9 and the exhaust channel 8 for several seconds until the predetermined vacuum degree is reached, creating a negative pressure state inside. This step reduces the possibility of defects such as bubbles and scorching caused by the presence of air in the product. High-temperature, uncured silicone rubber is injected into the emptied cavity 4. During the rubber filling process, even if there is a very small amount of residual gas or... The volatile gases produced during rubber vulcanization can also be discharged through the micron-level interconnected holes of the porous metal vent strip 10. Its unique structure utilizes the capillary effect to allow gas molecules to pass freely, but can completely block the highly viscous molten rubber, thus achieving the perfect effect of "venting only, without overflowing rubber" and solving the problem of clogging of the venting groove 7. After injection molding, a pressure holding stage is carried out to compensate for rubber shrinkage. While holding pressure, the mold temperature controller is started to introduce cooling water into the conformal cooling water channel 5 to efficiently and uniformly cool the mold, so that the rubber can undergo vulcanization reaction and solidify into shape.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rubber-coating injection mold for ultra-high voltage insulators, comprising a lower mold (1), an upper mold (2), and an insulator core rod (3) clamped between the lower mold (1) and the upper mold (2), characterized in that: The lower mold (1) and the upper mold (2) have cavities (4) on their respective pressing surfaces. Several conformal cooling channels (5) are evenly distributed around the periphery of the cavity (4). Cooling pipe interfaces (6) are installed at both ends of the conformal cooling channels (5) that protrude from the mold body. An exhaust groove (7) is provided on the inner wall of the cavity (4). A perforated metal exhaust strip (10) is installed in the exhaust groove (7). The exhaust groove (7) is connected to the vacuum interface (9) provided on the outer wall of the upper mold (2) through the exhaust channel (8).

2. The ultra-high voltage insulator coating injection mold according to claim 1, characterized in that: The lower mold (1) has vertical guide holes (11) at each of its four corners. The upper mold (2) has a guide rod (21) connected to each of its four corners corresponding to each guide hole (11). The guide rod (21) is used to slide through the guide hole (11).

3. The ultra-high voltage insulator coating injection mold according to claim 1, characterized in that: The distance between the conformal cooling channel (5) and the inner surface of the cavity (4) remains constant, and the distance ranges from 10 to 15 mm.

4. The ultra-high voltage insulator coating injection mold according to claim 1, characterized in that: The exhaust groove (7) has a length of 1-2 mm, a depth of 0.01-0.03 mm, and a width of 5-10 mm.

5. The ultra-high voltage insulator coating injection mold according to claim 1, characterized in that: The exhaust channel (8) and the conformal cooling water channel (5) are arranged alternately.

6. The ultra-high voltage insulator coating injection mold according to claim 1, characterized in that: The porous metal exhaust strip (10) is interference-fitted into the exhaust groove (7).

7. The ultra-high voltage insulator coating injection mold according to claim 1, characterized in that: The porous metal exhaust strip (10) is made of sintered bronze or stainless steel, with an average pore size of 5-15µm and a porosity of 20-35%.

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