A composite insulator and a potting process

Abstract

The present invention discloses a composite insulator and a potting process. The composite insulator includes a fitting member and an isolation ring. The fitting member includes a clamp groove and a steel foot. Assembly holes are provided at the bottom end of the clamp groove and the top end of the steel foot. An overflow glue groove is provided at the entrance of the assembly hole, and a plurality of constant pressure openings are provided at one end of the overflow glue groove away from the groove opening. The isolation ring is installed in the assembly hole and includes an upper ring, a clamping ring, and a lower ring. The upper ring and the lower ring are respectively connected to the upper and lower ends of the clamping ring. A plurality of overflow glue holes are provided at the upper end of the ring wall of the upper ring. A baffle is connected to the lower end of the ring wall of the lower ring. When installed, the clamping ring is clamped in the groove opening of the overflow glue groove and closes the groove opening. The overflow glue holes penetrate through the clamping ring from the upper ring to the lower end of the clamping ring and communicate with the overflow glue groove when the clamping ring is installed. The present invention realizes the integrated molding of the core rod, the fitting member, and the silicone umbrella skirt by designing the assembly hole structure on the fitting member and introducing the isolation ring component.

Description

Technical Field

[0001] The present invention relates to the technical field of insulator production, and specifically, to a composite insulator and a potting process. Background Art

[0002] A composite insulator is an insulating control component composed of a core rod, shed skirts, and metal components, mainly used to support conductors in overhead transmission lines and prevent current from returning to the ground; the core characteristics of composite insulators include light weight, high mechanical strength, and excellent anti-fouling flashover performance, so they are widely used. In the production process of composite insulators, the potting process belongs to the core connection and structure forming link. Among them, the potting process refers to bonding and forming the key components of composite insulators, including the core rod, fitting components, etc. through an adhesive, and filling the gaps to achieve sealing, preventing interface breakdown or environmental erosion.

[0003] In the traditional production and assembly process of composite insulators, the assembly between the core rod and fitting components usually adopts a crimping process or a potting process, that is, the core rod and fitting components are crimped together by a hydraulic press or bonded together using an adhesive. After crimping or potting, the silicone shed skirts are formed on the outside of the core rod through molding or injection molding. However, the traditional potting process requires step-by-step heating and curing of each fitting component and silicone shed skirts, with low efficiency and high time cost. Summary of the Invention

[0004] Aiming at the problems raised in the above background art, the purpose of the present invention is to provide a composite insulator and a potting process, which realize the integrated molding of the core rod, fitting components, and silicone shed skirts by designing a new assembly hole structure on the fitting components and introducing an innovative isolation ring component.

[0005] To achieve the above purpose, on the one hand, the present invention provides a composite insulator. In the technical solution of the present invention, the composite insulator includes a fitting component and an isolation ring. The fitting component includes a clip groove and a steel foot. Assembly holes are opened at the bottom end of the clip groove and the top end of the steel foot. An overflow groove is opened at the entrance of the assembly hole, and a plurality of constant pressure openings are provided at one end of the overflow groove away from the groove opening; the isolation ring is installed in the assembly hole. The isolation ring structure includes an upper ring, a clamping ring, and a lower ring. The upper ring and the lower ring are respectively connected to the upper and lower ends of the clamping ring. A plurality of overflow holes are opened at the upper end of the ring wall of the upper ring. A baffle is fixedly connected to the lower end of the ring wall of the lower ring. When installed, the clamping ring is clamped in the groove opening of the overflow groove and closes the groove opening. The overflow holes penetrate through the clamping ring from the upper ring to the lower end of the clamping ring and communicate with the overflow groove when the clamping ring is installed.

[0006] Preferably, the inner diameters of the upper ring, the clamping ring and the lower ring are the same and aligned. The outer diameter of the upper ring is equal to the inner diameter of the assembly hole. When the lower ring is installed, it closely adheres to the outer wall of the glue overflow groove, and the baffle blocks the multiple constant pressure openings.

[0007] Preferably, in the technical solution of the present invention, the composite insulator further includes a core rod and a silicone umbrella skirt. The diameter of the core rod is equal to the inner diameters of the upper ring, the clamping ring and the lower ring. The core rod is adhesively fixed in the assembly hole; the silicone umbrella skirt is injection molded outside the core rod.

[0008] Preferably, the upper ring, the clamping ring, the lower ring and the baffle are all made of silicone.

[0009] On the other hand, the present invention also proposes a potting process for assembling a composite insulator as described above, which specifically includes the following steps:

[0010] S1. Glue dispensing: Install isolation rings in the clamping wire groove and the assembly hole of the steel foot respectively. After the installation is completed, inject adhesive into the assembly hole.

[0011] S2. Insertion: Insert both ends of the core rod into the clamping wire groove and the assembly hole of the steel foot respectively.

[0012] S3. Injection molding: Put the core rod with the fitting components after the insertion into the molding die of the umbrella skirt for injection molding.

[0013] S4. Curing: After the injection molding is completed, raise the temperature of the molding die for curing.

[0014] Preferably, in the step S2, when the core rod is inserted into the assembly hole, the excess adhesive enters the glue overflow groove through the glue overflow hole. When the air pressure inside the glue overflow groove increases, the baffle is lifted through the multiple constant pressure openings for pressure relief.

[0015] Preferably, in the step S4, the temperature rising and curing includes multiple stages of temperature rising. The curing temperature of the adhesive is lower than the curing temperature of the silicone umbrella skirt. First, raise the temperature to the curing temperature of the adhesive to complete the curing of the adhesive, and then raise the temperature to the curing temperature of the silicone umbrella skirt to complete the curing and vulcanization of the silicone umbrella skirt.

[0016] Beneficial effects: In summary, the present invention provides a composite insulator and a potting process. In the technical solution of the present invention, a novel assembly hole structure is designed on the fitting component, an overflow groove is opened at the opening of the assembly hole to collect the overflow glue during the insertion and bonding process of the composite insulator core rod, and at the same time, an innovative isolation ring component is introduced. The silicone material property of the isolation ring is used to assist in positioning the core rod during the bonding process. On the other hand, the isolation ring and the silicone gasket are also used to close the notch and the constant pressure opening of the overflow groove. Under the action of the air pressure and the silicone material of the gasket, the constant pressure opening can also achieve the pressure relief function.

[0017] Other features and advantages of the present invention will be described in the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following will briefly introduce the drawings according to the embodiments of the present invention.

[0019] Figure 1 FIG. 1 is a schematic diagram of the overall structure of a composite insulator according to an embodiment of the present invention;

[0020] Figure 2 FIG. 2 is a schematic diagram of the structure of the fitting component according to an embodiment of the present invention;

[0021] Figure 3 FIG. 3 is a schematic sectional view of the fitting component according to an embodiment of the present invention;

[0022] Figure 4 FIG. 4 is a schematic sectional view of the clamping wire groove according to an embodiment of the present invention;

[0023] Figure 5 FIG. 5 is a schematic sectional view of the steel foot according to an embodiment of the present invention;

[0024] Figure 6 FIG. 6 is a schematic diagram of the structure of the isolation ring according to an embodiment of the present invention Figure 1 ;

[0025] Figure 7 FIG. 7 is a schematic diagram of the structure of the isolation ring according to an embodiment of the present invention Figure 2 ;

[0026] Figure 8 FIG. 8 is a schematic sectional view of the structure of the isolation ring according to an embodiment of the present invention;

[0027] Figure 9 FIG. 9 is a schematic diagram of the installation structure of the isolation ring according to an embodiment of the present invention;

[0028] Figure 10 FIG. 10 is a schematic sectional view of the installation structure of the isolation ring according to an embodiment of the present invention;

[0029] Figure 11Schematic diagram of the structure of a mandrel and a silicone rubber umbrella skirt according to an embodiment of the present invention;

[0030] Figure 12 Flow chart of a potting process according to an embodiment of the present invention;

[0031] In the figure: A, composite insulator; A01, clamping wire groove; A02, steel foot; A03, isolation ring; A04, mandrel; A05, silicone rubber umbrella skirt; B1, assembly hole; B2, glue overflow groove; B3, constant pressure opening; B4, upper ring; B5, snap ring; B6, lower ring; B7, glue overflow hole; B8, retaining piece. Detailed implementation manners

[0032] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings according to the embodiments of the present invention.

[0033] Figure 1 Schematic diagram of the overall structure of a composite insulator according to an embodiment of the present invention, as Figure 1 shown, the embodiment of the present invention includes a composite insulator A. Specifically, in this embodiment, the composite insulator A includes a fitting member and an isolation ring A03.

[0034] Figure 2 Schematic diagram of the structure of the fitting member according to an embodiment of the present invention, as Figure 2 shown, the fitting member includes a clamping wire groove A01 and a steel foot A02. Assembly holes B1 are provided at the bottom end of the clamping wire groove A01 and the top end of the steel foot A02. The assembly holes B1 are used for the insertion and assembly process of the composite insulator A, that is, by injecting an adhesive into the interior of the assembly holes B1, the bonding and assembly of the composite insulator A are carried out. It should be noted that Figure 3 Schematic diagram of the sectional structure of the fitting member according to an embodiment of the present invention, as Figure 3 shown, the assembly holes B1 at the bottom end of the clamping wire groove A01 and the assembly holes B1 at the top end of the steel foot A02 are symmetric along the horizontal direction. Figure 4 and Figure 5 Schematic diagrams of the sectional structures of the clamping wire groove A01 and the steel foot A02 according to an embodiment of the present invention, as Figure 4 and Figure 5 shown, glue overflow grooves B2 are provided at the entrances of the assembly holes B1 in the clamping wire groove A01 and the steel foot A02 in this embodiment, and a plurality of constant pressure openings B3 are provided at one end of the glue overflow groove B2 far from the groove opening. The glue overflow grooves B2 collect the excess adhesive in the assembly holes B1 during the insertion and assembly process of the composite insulator A.

[0035] Figure 6 and Figure 7 Schematic diagram of the structure of the isolation ring A03 according to an embodiment of the present invention, please refer to Figure 6 and Figure 7, in this embodiment, the isolation ring A03 structure includes an upper ring B4, a clamping ring B5, and a lower ring B6. The upper ring B4 and the lower ring B6 are respectively connected to the upper and lower ends of the clamping ring B5. The inner diameters of the upper ring B4, the clamping ring B5, and the lower ring B6 are the same and aligned. The outer diameter of the upper ring B4 is equal to the inner diameter of the assembly hole B1. A plurality of glue overflow holes B7 are provided at the upper end of the ring wall of the upper ring B4. A retaining piece B8 is fixedly connected to the lower end of the ring wall of the lower ring B6. The upper ring B4, the clamping ring B5, the lower ring B6, and the retaining piece B8 are all made of silica gel material. Figure 8 is a schematic cross-sectional structure diagram of the isolation ring A03 according to an embodiment of the present invention. Among them, as Figure 8 shown, the glue overflow hole B7 penetrates through the clamping ring B5 and leads from the upper ring B4 to the lower end of the clamping ring B5. Figure 9 and Figure 10 are schematic installation structure diagrams of the isolation ring according to an embodiment of the present invention. As Figure 9 and Figure 10 shown, in this embodiment, the isolation ring A03 is installed in the assembly hole B1. When the clamping ring B5 is installed, it is clamped in the notch of the glue overflow groove B2 and closes the notch. The glue overflow hole B7 communicates with the glue overflow groove B2 when the clamping ring B5 is installed. That is, the excess adhesive in the assembly hole B1 during the insertion and assembly process of the composite insulator A enters the glue overflow groove B2 through the glue overflow hole B7. The lower ring B5 is closely attached to the outer wall of the glue overflow groove B2 during installation, and the retaining piece B8 blocks a plurality of constant pressure openings B3. It should be noted that during the process of the adhesive entering the glue overflow groove B2 through the glue overflow hole B7, the gas pressure inside the glue overflow groove B2 increases due to the influence of the adhesive entering. When the pressure increases to the threshold value, the retaining piece B8 blocking the constant pressure opening B3 is lifted through a plurality of constant pressure openings B3. Since the retaining piece B8 is made of silica gel material, the threshold value of the pressure increase is affected by the material of the retaining piece B8.

[0036] Specifically, in this embodiment, Figure 11 is a schematic structure diagram of the core rod A04 and the silica gel umbrella skirt A05 according to an embodiment of the present invention. As Figure 11 shown, this embodiment of the composite insulator A further includes a core rod A04 and a silica gel umbrella skirt A05.

[0037] Among them, the diameter of the mandrel A04 is equal to the inner diameters of the upper ring B4, the snap ring B5, and the lower ring B6. When the mandrel A04 is installed, it is fixed in the assembly hole B1 by bonding. That is, after injecting the bonding glue into the interior of the assembly hole B1, the mandrel A04 is inserted for bonding and assembly. Since the diameter of the mandrel A04 is equal to the inner diameters of the upper ring B4, the snap ring B5, and the lower ring B6, when the mandrel A04 is inserted, it is supported by the isolation ring A03, that is, the inner walls of the upper ring B4, the snap ring B5, and the lower ring B6 support and position the mandrel A04. The mandrel A04 can be in the central position of the assembly hole B1 during the process of being inserted into the assembly hole B1. Compared with the insertion bonding process of the traditional process, it is more convenient for the insertion and positioning of the mandrel A04 in this embodiment; the silicone shed A05 is injection-molded outside the mandrel A04, that is, after the insertion and installation are completed, the mandrel A04 with the fitting components is placed into the molding die of the silicone shed A05 for injection molding.

[0038] This embodiment further includes a potting process for assembling a composite insulator A as described above. Figure 12 As a flowchart of a potting process according to an embodiment of the present invention, as Figure 12 shown, a potting process of this embodiment specifically includes the following steps:

[0039] S1. Dispensing: The isolation ring A03 is respectively installed in the clamping groove A01 and the assembly hole B1 of the steel foot A02. After the installation is completed, the bonding glue is injected into the assembly hole B1. Among them, the amount of the injected bonding glue is adjusted according to the glue overflow situation after the mandrel A04 is inserted, so that the bonding glue overflowing into the glue overflow groove B2 through the glue overflow hole B7 does not exceed the effective volume of the glue overflow groove B2.

[0040] S2. Insertion: Insert both ends of the mandrel A04 into the clamping wire groove A01 and the assembly hole B1 of the steel foot A02 respectively. It should be noted that the mandrel A04 is inserted into the clamping wire groove A01 and the assembly hole B1 of the steel foot A02 in the downward direction from top to bottom, that is, the clamping wire groove A01 is inverted and the two ends of the mandrel A04 are inserted into the non-simultaneous clamping wire groove A01 and the steel foot A02 in sequence. Since the diameter of the mandrel A04 is equal to the inner diameters of the upper ring B4, the snap ring B5 and the lower ring B6, that is, the assembly hole B1 is closed when the mandrel A04 is inserted, and the gas and adhesive inside the assembly hole B1 are extruded and discharged from the glue overflow hole B7. At the same time, under the action of gravity, the gas first enters the glue overflow groove B2 from the glue overflow hole B7, and then the excess adhesive enters the glue overflow groove B2 from the glue overflow hole B7. At the same time, when the gas and adhesive enter the glue overflow groove B2, the air pressure inside the glue overflow groove B2 increases and the retaining piece B8 is lifted by multiple constant pressure openings B3 for pressure relief. It should be noted that the opening directions of the multiple constant pressure openings B3 and the setting direction of the retaining piece B8 are downward along the assembly hole B1. Therefore, when the mandrel A04 is inserted into the assembly hole B1, it will not resist the constant pressure openings B3 and the retaining piece B8, while the notch of the glue overflow groove B2 will be resisted when the mandrel A04 is inserted, which is beneficial to the sealing at the notch of the glue overflow groove B2. At the same time, affected by the silica gel material of the retaining piece B8, the retaining piece B8 resumes the shielding of the constant pressure openings B3 under the action of its own elastic properties after pressure relief;

[0041] S3. Injection molding: Put the mandrel A04 with the fitting components after insertion into the molding die of the silica gel umbrella skirt A05 for injection molding;

[0042] S4. Curing: After injection molding, the molding die is heated for curing. The heating and curing include multiple stages of heating. The curing temperature of the adhesive is lower than the curing temperature of the silica gel umbrella skirt A05. First, it is heated to the curing temperature of the adhesive to complete the curing of the adhesive, and then it is heated to the curing temperature of the silica gel umbrella skirt A05 to complete the curing and vulcanization of the silica gel umbrella skirt A05. Compared with the separate curing of the traditional process, in this embodiment, the integrated molding of the mandrel A04, the fitting components and the silica gel umbrella skirt A05 is adopted, that is, the overall assembly of the mandrel A04 and the fitting components and the silica gel umbrella skirt A05 is completed through a single heating and curing process.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only the preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite insulator, characterized in that: include: The hardware component includes a wire clamping groove and a steel foot, wherein the bottom end of the wire clamping groove and the top end of the steel foot are both provided with an assembly hole, an overflowing glue groove is provided at the entrance of the assembly hole, and the overflowing glue groove is provided with a plurality of constant pressure openings at one end away from the groove; An isolation ring is installed in the assembly hole. The isolation ring structure includes an upper ring, a clamping ring and a lower ring. The upper ring and the lower ring are respectively connected to the upper and lower ends of the clamping ring. A plurality of glue overflow holes are provided at the upper end of the ring wall of the upper ring. A baffle is fixedly connected to the lower end of the ring wall of the lower ring. When the clamping ring is installed, it is clamped in the notch of the glue overflow groove and closes the notch. The glue overflow hole passes through the clamping ring from the upper ring to the lower end of the clamping ring and is connected to the glue overflow groove when the clamping ring is installed.

2. A composite insulator according to claim 1, characterized in that: The inner diameters of the upper ring, the retaining ring and the lower ring are the same and aligned, the outer diameter of the upper ring is equal to the inner diameter of the assembly hole, the lower ring is tightly attached to the outer wall of the overflow groove when installed and the baffle blocks the multiple constant pressure openings.

3. A composite insulator according to claim 2, characterized in that: Also includes: A core rod, the diameter of which is equal to the inner diameters of the upper ring, the clamping ring and the lower ring, and is adhesively fixed in the assembly hole; The silicone umbrella skirt is injection-molded on the outside of the core rod.

4. A composite insulator according to claim 3, characterized in that: The upper ring, the clamping ring, the lower ring and the baffle are all made of silicone.

5. A gluing process for assembling a composite insulator as claimed in claim 4, characterized in that: The specific steps include: S1. Glue dispensing: install the isolation ring in the assembly hole of the wire clamping groove and the steel foot respectively, and then inject the adhesive into the assembly hole after the installation is completed; S2. Insertion: insert the two ends of the mandrel into the assembly holes of the wire clamping groove and the steel foot respectively; S3, injection molding: placing the mandrel with the hardware components after the insertion into the shed molding mold for injection molding; S4, curing: After the injection molding is completed, the molding mold is heated and cured.

6. A binding process according to claim 5, characterized in that: In the step S2, when the core rod is inserted into the assembly hole, excess adhesive enters the adhesive overflow groove from the adhesive overflow hole. When the air pressure inside the adhesive overflow groove increases, the baffle is lifted up through the multiple constant pressure openings to release the pressure.

7. The binding process according to claim 5, characterized in that: In step S4, the temperature rise and curing includes multiple stages of temperature rise, the curing temperature of the adhesive is lower than the curing temperature of the silicone shed, the temperature is first raised to the curing temperature of the adhesive to complete the curing of the adhesive, and then the temperature is raised to the curing temperature of the silicone shed to complete the curing and vulcanization of the silicone shed.

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