CN211957290U - A hollow insulating core body, insulating cross arm and injection molding die - Google Patents

Abstract

The utility model provides a hollow insulating core, insulating cross arm and injection moulding mould. The hollow insulating core includes: an insulating tube with a hollow interior; the inner wall of the insulating pipe is provided with an inner sheath; an inner umbrella skirt structure is arranged on the inner sheath and used for increasing the creepage distance of the insulating pipe. The utility model discloses a set up the interior umbrella skirt structure that sets up on inner sheath and inner sheath on inside hollow insulating tube inner wall, increase the creepage distance of insulating tube, and then improve the internal insulation performance of this insulating cross arm to in guaranteeing the product, under the prerequisite of external insulation performance and mechanical properties, reduce product weight greatly.

Description

A hollow insulating core body, insulating cross arm and injection molding die

technical field

The utility model relates to the technical field of power transmission and transformation equipment, in particular to a hollow insulating core body, an insulating cross arm and an injection molding die.

Background technique

Lightning-induced overvoltage is the main factor leading to disconnection of overhead lines in distribution network (10kV). In order to improve the lightning resistance level of the 10 kV line, especially to avoid the line tripping and disconnection due to induced lightning strikes, improving the line insulation level is an important means. With the development of composite material manufacturing technology, the electrical and mechanical properties of composite materials have been greatly improved, and the use of composite insulating crossarms for lightning protection transformation of 10 kV lines has received increasing attention. The application of composite insulation cross arm in distribution network can greatly improve the lightning resistance level of the line. At present, the commonly used cross-sections of composite insulation cross-arms for distribution network are mainly solid circle, hollow circle, solid circle and hollow rectangle. However, in the actual application process, the weight of the solid composite insulating cross-arm is relatively large, which has a certain impact on the convenience of installation, while the hollow composite insulating cross-arm has problems such as internal insulation, which has a certain impact on the safe and stable operation of the line. .

SUMMARY OF THE INVENTION

In view of this, the utility model proposes a hollow insulating core body, an insulating cross arm and an injection molding die, which aims to solve the problems that the existing insulating cross arm is heavy, which makes it inconvenient to install or has poor internal insulation performance, which affects the safe and stable operation of the line. .

On the one hand, the utility model proposes a hollow insulating core body, the hollow insulating core body comprises: an insulating tube with a hollow inside; wherein, an inner sheath is provided on the inner wall of the insulating tube; and an inner sheath is provided on the inner sheath There is an inner umbrella skirt structure to increase the creepage distance of the insulating pipe.

Further, in the above hollow insulating core body, an outer sheath is provided on the outer wall of the insulating tube, and an outer shed structure is provided on the outer sheath.

Further, in the above hollow insulating core body, the inner shed structure and/or the outer shed structure are multiple and are arranged at intervals along the length direction of the insulating tube.

Further, in the above-mentioned hollow insulating core, the inner shed structure and the inner sheath are integrated structures, and the materials thereof are all organic polymer materials; and/or, the outer sheath and the outer shed The structure is an integrated structure, and its materials are all organic polymer materials.

On the other hand, the present invention also proposes an insulating cross arm, which is provided with the above-mentioned hollow insulating core.

Further, in the above-mentioned insulating cross-arm, both ends of the hollow insulating core body are provided with connecting fittings for connecting the supporting member or the conductor.

The hollow insulating core body and the insulating cross arm provided by the utility model are both provided with an inner sheath on the inner wall of the hollow insulating pipe and an inner shed structure arranged on the inner sheath, so as to increase the creepage distance of the insulating pipe, thereby increasing the creepage distance of the insulating pipe. Improve the inner insulation performance of the insulating cross arm, thereby greatly reducing the weight of the product on the premise of ensuring the inner and outer insulation properties and mechanical properties of the product, so that the hollow insulating core and the insulating cross arm can avoid solid insulating cross arms on the one hand. There are the problems of heavy weight and inconvenient installation. At the same time, the built-in inner shed structure increases the creepage distance between the insulating cross arm and the hollow insulating core, and can improve the internal insulation performance of the hollow insulating core and the insulating cross arm.

On the other hand, the utility model also proposes an injection molding mold for injection molding the inner sheath and shed of the hollow insulating core. The injection molding mold includes: a shed injection machine, a movable mold and a The fixed mold on the shed injection machine; wherein, the fixed mold and the movable mold are both arranged in the injection cavity of the shed injection machine, and the fixed mold and the movable mold are detachable The end of the movable mold away from the fixed mold is provided with a pressing part to close the injection cavity, so that the fixed mold, the movable mold and the shed injection machine are enclosed A forming cavity is set up to match the structure of the inner sheath and the inner shed.

Further, in the above injection molding mold, a positioning structure is provided on the shed injection machine for positioning and fixing the movable mold and/or the fixed mold.

Further, in the above-mentioned injection molding mold, the fixed mold is provided with an insulating tube positioning portion for positioning the insulating tube.

In the injection molding die provided by the utility model, by arranging a fixed die on the shed injection machine, and a movable die detachably connected to the fixed die, the fixed die, the movable die and the shed shed injection machine are surrounded and arranged to form an inner wall. The molding cavity is matched with the structure of the sheath and the inner shed, thereby improving the processing of the inner sheath and the inner shed structure on the insulating tube by glue injection, so that the inner sheath and the inner shed structure can avoid the solid state on the one hand. The insulating cross-arm has the problems of heavy weight and inconvenient installation. At the same time, the inner shed structure is built in, which increases the creepage distance between the insulating cross-arm and the hollow insulating core, and can improve the internal insulation performance of the hollow insulating core and the insulating cross-arm. .

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are only for the purpose of illustrating the preferred embodiments, and are not considered to be a limitation of the present invention. Also, the same components are denoted by the same reference numerals throughout the drawings. In the attached image:

1 is a schematic structural diagram of a split-type insulating cross arm provided by an embodiment of the present utility model;

2 is a schematic structural diagram of an integral insulating cross arm provided by an embodiment of the present invention;

3 is a schematic structural diagram of an arrangement of an insulating cross arm provided by an embodiment of the present invention;

Fig. 4 is another structural schematic diagram of the arrangement of insulating cross-arms provided by an embodiment of the present invention;

5 is a schematic structural diagram of an injection molding mold provided by an embodiment of the present invention;

FIG. 6 is a cross-sectional view at A-A in FIG. 5 .

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly understood, and will fully convey the scope of the present disclosure to those skilled in the art. It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict. The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

Example of insulating cross arm:

Referring to FIG. 1 to FIG. 4 , it is the preferred structure of the insulating cross arm provided by the embodiment of the present invention. As shown in the figure, the insulating cross arm includes: a hollow insulating core 1 and two connecting fittings 2; wherein,

Both ends of the hollow insulating core body 1 are provided with connecting fittings 2 for connecting the supporting member 3 or conductors (not shown in the figure), so as to fix the conductors on the hollow insulating core body 1 through the connecting fittings 2 and connect the The fittings 2 are fixed to the hollow insulating core 1 to the support member 3 . Specifically, the insulating cross-arm has two types of structures: analytical type and integral type. For the split type structure, there is one hollow insulating core 1 and the two connecting fittings 2 provided at both ends are the wire hanging fittings and the fixing fittings, respectively. The hanging wire fittings are used to hang conductors, especially metal conductors, and the fixing fittings are used to fix the insulating cross arm to the supporting member 3 as a whole, wherein the supporting member 3 can be a supporting member such as a pole tower. For the monolithic structure, there are two hollow insulating cores 1, the two hollow insulating cores 1 are symmetrically arranged and connected by a connecting fitting 2, and the ends of the two hollow insulating cores 1 away from the other are connected with each other. The fitting 2, the connecting fitting can be a wire hanging fitting, and the integral insulating cross arm is fixed to the supporting member 3 through the connecting fitting 2 in the middle position, so that the two hollow insulating cores 1 are symmetrically arranged with respect to the supporting member 3. As shown in FIG. 3 and FIG. 4 , a plurality of integral insulating cross-arms arranged in parallel may be provided on the support member 3 , and an integral insulating cross-arm and a split-type insulating cross-arm may also be provided in parallel.

In the above embodiment, the hollow insulating core body 1 includes: an insulating tube 11; wherein,

The insulating tube 11 has an internal hollow structure. In order to facilitate the injection molding of the inner sheath 12 and the shed 13 of the insulating tube 11, preferably, the insulating tube 11 can be an internal hollow structure with open ends to reduce the weight of the hollow insulating core 1, thereby reducing the insulating cross-arm. weight, in order to improve the installation convenience of the insulating cross arm. Wherein, the cross section of the insulating tube 11 may be a ring structure or a square ring structure, and certainly may be other ring structures, which are not limited in this embodiment. In this embodiment, a ring structure is used as an example for description. Wherein, the material of the insulating tube 11 can be resin-impregnated glass fiber, which is used as an inner insulating part of the insulating cross arm and is used to ensure the mechanical properties of the insulating cross arm.

An inner sheath 12 is provided on the inner wall of the insulating tube 11 . Specifically, the inner sheath 12 is an annular structure, which is embedded on the inner wall of the insulating tube 11 to increase the creepage distance of the insulating tube 11 .

The inner sheath 12 is provided with an inner shed structure 13 to increase the creepage distance of the insulating tube 11 to improve the internal insulation performance of the insulating cross arm, that is, the inner shed structure 13 is sleeved on the inner wall of the inner sheath 12 and the end away from the inner sheath 12 is disposed toward the axis of the insulating tube 11 . In order to further improve the inner insulation performance of the insulation cross arm, preferably, the inner shed structures 13 can be multiple and arranged at intervals along the length direction of the insulation tube (the horizontal direction as shown in FIG. 1 ) to ensure the hollow insulation core. Internal insulating properties of body 1. Further preferably, the plurality of inner shed structures 13 can be uniformly distributed along the length direction of the insulating tube 11 . Wherein, the inner shed structure 13 and the inner sheath 12 may be an integral structure, so as to improve the connection strength between the inner shed structure 13 and the inner sheath 12 . Preferably, the materials of the inner shed structure 13 and the inner sheath 12 can both be organic polymer materials, so as to further ensure the inner insulation performance of the insulation cross arm. Further preferably, the inner shed structure 13 and the inner sheath 12 are made of silicon rubber material.

In the above embodiment, the outer sheath 14 is provided on the outer wall of the insulating tube 11 , and the outer shed structure 15 is provided on the outer sheath 14 . Specifically, the outer sheath 14 is an annular structure and is sleeved outside the insulating tube 11 to serve as an outer insulating member of the insulating cross arm to protect the insulating tube 11 from being corroded by the environment. The outer shed structure 15 is sleeved outside the insulating tube 11, and the end away from the inner sheath 12 is set towards the periphery of the insulating tube 11, so as to increase the creepage distance of the insulating tube 11 and improve the external insulation of the insulating cross arm. performance. In order to further insulate the insulating tube 11, preferably, the outer shed structures 15 can be multiple, and the plurality of outer shed structures 15 are all sleeved outside the insulating tube 11, and each outer shed structure 15 shells along the insulating tube 11. The length direction of the sheds is evenly spaced, and the outer shed structure 15 can increase the creepage distance of the insulating cross arm, and has the function of blocking water. Wherein, the outer shed structure 15 and the outer sheath 14 may be an integral structure, so as to improve the connection strength between the outer shed structure 15 and the outer sheath 14 . Preferably, the materials of the outer shed structure 15 and the outer sheath 14 can both be organic polymer materials, so as to further ensure the outer insulation performance of the insulation cross-arm. Further preferably, the outer shed structure 15 and the outer sheath 14 are made of silicone rubber material.

To sum up, the hollow insulating core body and the insulating cross arm provided in this embodiment are both provided with the inner sheath 12 on the inner wall of the inner hollow insulating tube 11 and the inner shed structure 13 provided on the inner sheath 12 to increase the insulation. The creepage distance of the pipe 11 is improved, thereby improving the internal insulation performance of the insulating cross arm, so as to greatly reduce the weight of the product under the premise of ensuring the internal and external insulation performance and mechanical properties of the product, so that the hollow insulating core body and the insulating cross arm can be On the one hand, it can avoid the problems of heavy weight and inconvenient installation of the solid insulating cross-arm. At the same time, the inner shed structure 13 is built in, which increases the creepage distance between the insulating cross-arm and the hollow insulating core Internal insulating properties of insulating crossarms.

Example of injection molding mold:

This embodiment also proposes an injection molding die for injection molding the inner sheath 12 and the inner shed structure 13 of the hollow insulating core 1 described above. Referring to FIG. 5 and FIG. 6 , it shows the preferred structure of the injection molding die provided by this embodiment. The injection molding mold includes: a fixed mold 4, a movable mold 5 and an shed injection machine 6; wherein,

The fixed mold 4 is arranged on the shed injection machine 6, the fixed mold 4 and the movable mold 5 are both located in the injection cavity of the shed injection machine 6, and the fixed mold 4 and the movable mold 5 are detachably connected. Specifically, the shed injection machine 6 uses the fixed mold 4 and the movable mold 5 to make the thermoplastic or thermosetting material into a plastic product of a preset shape, that is, the thermoplastic or thermosetting material is formed on the inner wall of the insulating tube 11 into the inner sheath 12 and the inner umbrella Skirt structure 13 . The shed injection machine 6 is provided with an injection cavity, which is adapted to the insulating tube 11, so as to fix the insulating tube 11 in the injection cavity, thereby realizing the injection of the inner sheath 12 and the inner shed structure 13, such as injection The cavity may have a cylindrical or prismatic structure. In this embodiment, a cylindrical structure is used as an example for description. The fixed mold 4 is set on the shed injection machine 6 , and the fixed mold 4 is located in the injection cavity and is coaxial with the injection cavity, so that the inner sheath 12 and the inner shed structure 13 are along the circumferential direction of the insulating tube 11 . Uniform distribution, ie ensuring uniform wall thickness of the inner sheath 12 . Wherein, in order to facilitate the disassembly of the fixed mold 4, preferably, the fixed mold 4 and the shed injection machine 6 are detachably connected. In order to realize the fixing of the fixed mold 4 , the shed injection machine 6 is provided with a first positioning structure (not shown in the figure) to realize the positioning and fixing of the fixed mold 4 . In order to realize the fixation of the insulating tube 11, preferably, an insulating tube positioning portion is provided on the fixed mold 4 for positioning the insulating tube 11, so that the insulating tube 11 is fixed in the injection cavity, thereby injecting the insulating tube 11, The inner sheath 12 and the inner shed structure 13 are fixed on the insulating tube 11 . The insulating tube positioning portion may be an annular positioning groove, so that the insulating tube 11 is inserted into the annular positioning groove. The movable mold 5 is arranged on one side of the fixed mold 4 (the left side as shown in FIG. 5 ) and is arranged coaxially with the fixed mold 4, that is, the movable mold 5 and the fixed mold 4 are both arranged in the injection cavity and are both connected to the injection cavity. The cavity is coaxially arranged. Wherein, the fixed mold 4 and the movable mold 5 can be detachably connected through the connecting member 7, and can also be detachably connected by other means, so as to facilitate the removal of the hollow insulating core 1 produced in the injection cavity. Of course, the connecting member 7 can be a positioning pin or a screw, for example, the positioning pin or screw is provided on the movable mold 5, and the fixed mold 4 is provided with a hole position matching the positioning pin or screw, so as to be inserted through the positioning pin or screw In the hole position of the fixed mold 4, the positioning and connection between the two are further realized, so as to avoid the relative movement between the two during injection. In order to avoid the movement of the movable mold 5 during the injection process, preferably, the shed injection machine 6 is provided with a second positioning structure (not shown in the figure) for positioning and fixing the movable mold 4 . One or both of the first positioning structure and the second positioning structure may be provided to ensure the stability of the fixed mold 4 and the movable mold 5 during injection at the same time.

One end of the movable mold 5 away from the fixed mold 4 (the left end as shown in FIG. 5 ) is provided with a pressing portion 51 to close the injection cavity, so that the fixed mold, the movable mold and the shed injection machine are surrounded by a The inner sheath and the inner shed are suitable for the cavity. Specifically, the pressing portion 51 can be a disc structure with an outer diameter larger than the inner diameter of the injection cavity, so as to press against the shed injection machine 6, thereby realizing the sealing of the injection cavity, ensuring that the fixed mold 4, the movable mold 5 and the A molding cavity adapted to the inner sheath 12 and the inner shed structure 13 is surrounded between the shed injection machines 6, and the molding cavity is closed, so that the inner sheath 12 and the inner shed can be realized through the molding cavity. Injection molding of the shed structure 13 . In order to realize the injection of the inner sheath 12 and the inner shed structure 13 , preferably, the pressing portion 51 is provided with an injection hole 511 for injecting thermoplastic or thermosetting material into the molding cavity.

In the above embodiment, the first positioning structure includes a first annular protrusion and a first annular groove; wherein,

The first annular protrusion is arranged on the side wall 61 of the injection cavity of the shed injection machine 6 (the right side wall as shown in FIG. 1 ). The fixed mold 4 is clamped and fixed on the first annular protrusion through the first annular groove.

The structure of the second positioning structure may be similar to that of the first positioning structure, and may also be implemented in other ways, which will not be described in detail in this embodiment.

Injection molding process:

First, fix the fixed mold 4 on the shed injection machine 6, and fix the insulating tube 11 to be injected on the fixed mold 4 through the insulating tube positioning part;

Then, the movable mold 5 is fixed to the fixed mold 4 and the shed injection machine 6 through the positioning pins and the second positioning structure, so that the movable mold 5, the fixed mold 4 and the insulating tube 22 are tightly assembled;

The injection molding mold is heated to the temperature required by the injection process, and the glue is injected through the glue injection hole 511, and the inner shed structure 13 and the inner sheath 12 are formed by controlling the injection pressure and the vulcanization temperature;

Finally, after the inner shed structure 13 and the inner sheath 12 are formed, the upper fixed mold 4 is removed first, and then the insulating tube 11 with the inner shed structure 13 and the inner sheath 12 is taken out.

To sum up, in the injection molding mold provided in this embodiment, the fixed mold 4 and the movable mold 5 which are detachably connected to the fixed mold 4 are arranged on the shed skirt injection machine 6, so that the fixed mold 4, the movable mold 5 and the umbrella are formed. The skirt injection machine 6 is surrounded by a molding cavity suitable for the inner sheath 12 and the inner shed structure 13, thereby improving the processing of the inner sheath 12 and the inner shed structure 13 on the insulating tube 11 by increasing the glue injection. Therefore, the inner sheath 12 and the inner shed structure 1 are used to avoid the problems of heavy weight and inconvenient installation of the solid insulating cross arm, and at the same time, the inner shed structure 13 is built in to increase the insulating cross arm and the hollow insulating core. 1 The internal creepage distance can improve the internal insulation performance of the hollow insulating core 1 and the insulating cross arm.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalents, the present utility model is also intended to include these modifications and variations.

Claims (10)

1. A hollow insulating core for an insulating cross-arm, comprising: an insulating tube (11) having a hollow interior; wherein,

an inner sheath (12) is arranged on the inner wall of the insulating pipe (11);

an inner umbrella skirt structure (13) is arranged on the inner sheath (12) and used for increasing the creepage distance of the insulating pipe (11).

2. The hollow insulating core according to claim 1,

an outer sheath (14) is arranged on the outer wall of the insulating pipe (11), and an outer umbrella skirt structure (15) is arranged on the outer sheath (14).

3. The hollow insulating core according to claim 2,

the inner umbrella skirt structure (13) and/or the outer umbrella skirt structure (15) are multiple and are arranged at intervals along the length direction of the insulating pipe (11).

4. The hollow insulating core according to claim 2,

the inner umbrella skirt structure (13) and the inner sheath (12) are of an integral structure and are made of organic polymer materials; and/or the presence of a gas in the gas,

the outer sheath (14) and the outer umbrella skirt structure (15) are of an integral structure and are made of organic polymer materials.

5. A hollow insulating core according to any of claims 1 to 4, characterised in that the material of the insulating tube (11) is resin impregnated glass fibre.

6. An insulating cross-arm, characterized in that a hollow insulating core (1) according to any of claims 1 to 5 is provided.

7. The insulating cross arm of claim 6,

the two ends of the hollow insulating core body (1) are provided with connecting hardware fittings (2) used for connecting supporting members or conductors.

8. An injection moulding mould for injection moulding an inner sheath (12) and an inner shed structure (13) of a hollow insulating core as claimed in any of claims 1 to 5, comprising: the umbrella skirt injection machine comprises an umbrella skirt injection machine (6), a movable mould (5) and a fixed mould (4) arranged on the umbrella skirt injection machine (6); wherein,

the fixed mould (4) and the movable mould (5) are both arranged in an injection cavity of the umbrella skirt injection machine (6), and the fixed mould (4) and the movable mould (5) are detachably connected;

and one end of the movable mould (5) far away from the fixed mould (4) is provided with a pressing part (51) for sealing the injection cavity, so that a molding cavity matched with the inner sheath (12) and the inner umbrella skirt structure (13) is formed among the fixed mould (4), the movable mould (5) and the umbrella skirt injection machine (6).

9. Injection molding mold according to claim 8,

and the umbrella skirt injection machine (6) is provided with a positioning structure for positioning and fixing the movable mould (5) and/or the fixed mould (4).

10. Injection molding mold according to claim 8 or 9,

and the fixed die (4) is provided with an insulating tube positioning part for positioning the insulating tube (11).

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