A post insulator

Abstract

This invention provides a post insulator, belonging to the technical field of post insulators. It solves the problems of existing post insulators' inability to buffer and short service life. This post insulator includes a first core rod, a second core rod, an elastic insulating skirt, and an elastic damping element. Both the first and second core rods are fixed within the insulating skirt. The elastic damping element passes through the insulating skirt and is located between the first and second core rods. The elastic damping element is fixedly connected to both the first and second core rods, allowing the first and second core rods to move relative to each other along the axial direction of the insulating skirt. This post insulator has the advantage of allowing for a certain deformation along the axial direction of the insulating skirt, thus improving its service life.

Description

Technical Field

[0001] This invention belongs to the technical field of post insulators and relates to a post insulator. Background Technology

[0002] Post insulators play two fundamental roles in overhead transmission lines: supporting the conductors and preventing current from returning to the ground. Existing post insulators mainly consist of a resin core rod, insulating skirts, and connecting hardware at both ends. The resin core rod is rigid, and the axial height of the post insulator cannot be adjusted. This leads to a problem of hard-on-hard contact during use, causing stress concentration inside the post insulator, resulting in damage and reduced service life.

[0003] To address the aforementioned problems, various improvements have been made, and some have even been patented. For example, Chinese patent literature discloses a damping protective pad for the head of a needle-type polymeric crystalline silicon insulator [Patent No.: 201721635826.0; Application Publication No.: CN207572147U]. This pad includes a cylindrical body made primarily of ethylene propylene diene monomer (EPDM) or silicone rubber. The cylindrical body has a top plate, and the middle of the cylindrical wall protrudes outward to form an annular protrusion. The lower end of the cylindrical body extends radially outward to form an umbrella skirt. The upper surface of the top plate is recessed radially to form a through groove.

[0004] This type of damping pad is primarily made of EPDM or silicone rubber. It possesses a certain degree of elasticity, meaning it can absorb some deformation, thus protecting the insulator from direct impact and damage due to external forces. However, this type of damping pad is located outside the insulator and is in direct contact with bare conductors and binding wires. This makes it susceptible to damage. Damaged pads lose their ability to absorb deformation, ultimately causing the insulator to come into direct contact with external components, resulting in continued direct impact damage and a reduced service life. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a post insulator. The technical problem solved is how to make the post insulator have a certain deformation along the axial direction of the insulating skirt, thereby improving the service life of the post insulator.

[0006] The objective of this invention can be achieved through the following technical solution: A post insulator includes a first core rod, a second core rod, and an elastic insulating skirt, wherein both the first core rod and the second core rod are fixed in the insulating skirt. The post insulator further includes an elastic damping element, which is inserted into the insulating skirt and located between the first core rod and the second core rod. The elastic damping element is fixedly connected to both the first core rod and the second core rod, and allows the first core rod and the second core rod to move relative to each other along the axial direction of the insulating skirt.

[0007] Both the elastic damping element and the insulating shed are elastic. When the post insulator is subjected to an outward tensile force along the axial direction of the insulating shed, the elastic damping element elastically elongates along the axial direction of the insulating shed. The insulating shed adapts by elongating, causing the first and second core rods to move outward along the axial direction of the insulating shed, increasing the length of the post insulator. This reduces the internal stress of the post insulator, making it less prone to damage and extending its service life. When the post insulator is subjected to an inward compressive force along the axial direction of the insulating shed, the elastic damping element elastically compresses along the axial direction of the insulating shed. The insulating shed adapts by shortening, causing the first and second core rods to move inward along the axial direction of the insulating shed, shortening the length of the post insulator. This further reduces the internal stress of the post insulator, making it less prone to damage. This elastic damping element is located inside the post insulator, not exposed, making it less susceptible to damage. Furthermore, the placement of the elastic damping element allows for a certain deformation of the post insulator along the axial direction of the insulating shed, preventing stress concentration within the post insulator and further reducing its risk of damage.

[0008] In one type of post insulator described above, the elastic damping element includes an elastic body and an elastic metal ring embedded in the body. The body is fixedly connected to both the first and second core rods. The metal ring has a circular or elliptical cross-section, and its axial direction is perpendicular to the axial direction of the insulating shed. This structure allows the metal ring to be stretched or flattened along the axial direction of the insulating shed, and the elastic damping element to be extended or shortened along the axial direction of the insulating shed. The elastic damping element is bidirectionally elastic, allowing the post insulator to extend or shorten. The structure is simple and ingeniously designed, enabling the post insulator to have a certain deformation along the axial direction of the insulating shed.

[0009] In another scenario, in one type of post insulator described above, the elastic damping element comprises an elastic body and an elastic metal ring embedded within the body. The body is fixedly connected to both the first and second core rods. The metal ring has a rectangular or square cross-section, with two sides perpendicular to the axial direction of the insulating shed and the other two sides parallel to the axial direction of the insulating shed. The other two sides of the metal ring, parallel to the axial direction of the insulating shed, cannot be stretched due to the properties of metal, but can bulge outwards and be flattened. This allows the metal ring to be flattened along the axial direction of the insulating shed, but not stretched. The elastic damping element can only shorten. The elastic damping element is unidirectionally elastic, allowing the post insulator to shorten. This design is simple and ingenious, giving the post insulator a certain deformation along the axial direction of the insulating shed.

[0010] In one type of post insulator described above, the elastic damping element is integrally molded by injection molding, and the main body covers a metal ring. This structure ensures that the main body completely encloses the metal ring, guaranteeing that the elastic damping element has sufficient elasticity while also possessing sufficient stiffness.

[0011] In the aforementioned type of post insulator, the outer wall of the main body has a protruding, annular connecting portion, and the inner wall of the insulating shed has a protruding, annular fixing portion. The connecting portion and the fixing portion are fixedly connected, thus fixing the elastic damping element to the insulating shed. This structure allows the elastic damping element and the insulating shed to be directly connected, enabling better transmission of the deformation of the elastic damping element to the insulating shed, allowing the insulating shed to better adapt to deformation. The deformation generated by the elastic compression of the elastic damping element can be transmitted to the insulating shed through the connecting portion and the fixing portion, allowing the insulating shed at this location to protrude outward along its own radial direction to absorb the deformation caused by the elastic damping element. Similarly, the insulating shed at this location can be concave inward along its own radial direction to compensate for the deformation caused by the elastic damping element.

[0012] In one type of post insulator described above, the elastic damping element separates the first core rod and the second core rod. This ensures that the post insulator has a certain deformation along the axial direction of the insulating skirt, preventing the first and second core rods from contacting each other, thus avoiding hard-on-hard collisions and making the post insulator less prone to damage.

[0013] In one type of post insulator described above, the inner ends of the first core rod and / or the second core rod have receiving grooves, and the main body portion is embedded and fixed in the receiving grooves. This structure ensures the radial stiffness of the post insulator.

[0014] In one type of post insulator described above, the first core rod is located above the second core rod, and both the outer ends of the first and second core rods have connecting holes.

[0015] In one of the above-mentioned post insulators, the first core rod, the second core rod, the insulating skirt, and the elastic damping element are bonded together by adhesive.

[0016] In one of the aforementioned post insulators, the insulating skirt is made of silicone rubber.

[0017] Compared with the prior art, the post insulator provided by the present invention has the following advantages:

[0018] 1. This post insulator is equipped with an elastic damping element, which allows the post insulator to have a certain deformation along the axial direction of the insulating skirt, avoiding stress concentration inside the post insulator and making the post insulator less prone to damage; at the same time, the elastic damping element is located inside the post insulator and is not exposed, making the elastic damping element less prone to damage, thus making the post insulator less prone to damage.

[0019] 2. When the cross-section of the metal ring of this elastic damping component is circular or elliptical, the elastic damping component is bidirectionally elastic, allowing the post insulator to both elongate and shorten; when the cross-section of the metal ring of this elastic damping component is rectangular or square, the elastic damping component is unidirectionally elastic, allowing the post insulator to shorten but not lengthen. It has multiple functions and can meet different needs. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the overall structure of Embodiment 1 of this post insulator.

[0021] Figure 2 This is a cross-sectional view of the overall structure of Embodiment 2 of this post insulator.

[0022] In the figure, 1 is the first core rod; 2 is the second core rod; 3 is the insulating skirt; 31 is the fixing part; 4 is the elastic damping element; 41 is the main body; 42 is the metal ring; 43 is the connecting part; 5 is the receiving groove; and 6 is the connecting hole. Detailed Implementation

[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0024] Example 1

[0025] like Figure 1 As shown, this post insulator includes a first core rod 1, a second core rod 2, an insulating shed 3, and an elastic damping element 4. Both the first core rod 1 and the second core rod 2 are made of glass fiber reinforced epoxy resin, and the insulating shed 3 is made of silicone rubber.

[0026] The first core rod 1, the second core rod 2, and the elastic damping element 4 are all inserted and fixed in the insulating skirt 3. The elastic damping element 4 is located between the first core rod 1 and the second core rod 2. The first core rod 1, the second core rod 2, the insulating skirt 3, and the elastic damping element 4 are bonded and fixed together by adhesive.

[0027] Specifically, the elastic damping element 4 includes an elastic body 41, an elastic metal ring 42 embedded in the body 41, and a ring-shaped connecting portion 43 protruding from the outer wall of the body 41. Both the body 41 and the connecting portion 43 are made of rubber, while the metal ring 42 is made of stainless steel. The elastic damping element 4 is integrally molded by injection molding, with the body 41 covering and filling the interior of the metal ring 42. In this embodiment, the metal ring 42 has a circular cross-section, and its axial direction is perpendicular to the axial direction of the insulating skirt 3. In actual production, the cross-section of the metal ring 42 can be elliptical. The inner wall of the insulating skirt 3 has a protruding ring-shaped fixing portion 31, and the connecting portion 43 is fixedly connected to the fixing portion 31, thus fixing the elastic damping element 4 to the insulating skirt 3.

[0028] In this embodiment, the inner end of the first core rod 1 has a receiving groove 5, and the main body 41 is partially embedded and fixed in the receiving groove 5. The main body 41 is fixedly connected to both the first core rod 1 and the second core rod 2. The elastic damping member 4 separates the first core rod 1 and the second core rod 2. In actual production, the receiving groove 5 can be located at the inner end of the second core rod 2, or the receiving groove 5 can be divided into two parts, located at the inner ends of the first core rod 1 and the second core rod 2 respectively. The first core rod 1 is located above the second core rod 2, and both the outer ends of the first core rod 1 and the second core rod 2 have connecting holes 6.

[0029] When the post insulator is subjected to an outward tensile force along the axial direction of the insulating shed 3, the elastic damping element 4 is elongated along the axial direction of the insulating shed 3, and the insulating shed 3 adaptably elongates, causing the post insulator to elongate along the axial direction of the insulating shed 3. When the post insulator is subjected to an inward compressive force along the axial direction of the insulating shed 3, the elastic damping element 4 is compressed along the axial direction of the insulating shed 3, and the insulating shed 3 adaptably shortens, causing the post insulator to shorten along the axial direction of the insulating shed 3.

[0030] Example 2

[0031] like Figure 2 As shown, the structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference is that in this embodiment, the cross-section of the metal ring 42 is rectangular, two sides of the metal ring 42 are perpendicular to the axis of the insulating skirt 3, and the other two sides of the metal ring 42 are parallel to the axis of the insulating skirt 3. In actual production, the cross-section of the metal ring 42 can be square.

[0032] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

[0033] Although this document frequently uses terms such as first core rod 1, second core rod 2, insulating skirt 3, fixing part 31, elastic damping element 4, main body 41, metal ring 42, connecting part 43, receiving groove 5, and connecting hole 6, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A post insulator, comprising a first core rod (1) and an elastic insulating shed (3), characterized in that, The post insulator also includes a second core rod (2) and an elastic damping element (4). The first core rod (1) and the second core rod (2) are both fixed in the insulating skirt (3). The elastic damping element (4) is inserted into the insulating skirt (3) and is located between the first core rod (1) and the second core rod (2). The elastic damping element (4) is fixedly connected to both the first core rod (1) and the second core rod (2). The elastic damping element (4) allows the first core rod (1) and the second core rod (2) to move relative to each other along the axial direction of the insulating skirt (3). The damping element (4) includes an elastic body (41) and an elastic metal ring (42) embedded in the body (41). The body (41) is fixedly connected to the first core rod (1) and the second core rod (2). The cross-section of the metal ring (42) is circular or elliptical. The axial direction of the metal ring (42) is perpendicular to the axial direction of the insulating umbrella skirt (3). The elastic damping element (4) is integrally formed by injection molding. The body (41) covers the metal ring (42) and fills the interior of the metal ring (42).

2. A post insulator according to claim 1, characterized in that, The outer side wall of the main body (41) has a protruding and annular connecting part (43), and the inner side wall of the insulating umbrella skirt (3) has a protruding and annular fixing part (31). The connecting part (43) and the fixing part (31) are fixedly connected to each other so that the elastic damping member (4) is fixedly connected to the insulating umbrella skirt (3).

3. A post insulator according to claim 1 or 2, characterized in that, The elastic damping element (4) separates the first core rod (1) and the second core rod (2).

4. A post insulator according to claim 1 or 2, characterized in that, The inner ends of the first core rod (1) and / or the second core rod (2) have receiving grooves (5), and the main body (41) is partially embedded and fixed in the receiving grooves (5).

5. A post insulator according to claim 1 or 2, characterized in that, The first core rod (1) is located above the second core rod (2), and the outer ends of the first core rod (1) and the second core rod (2) both have connecting holes (6).

6. A post insulator according to claim 1 or 2, characterized in that, The first core rod (1), the second core rod (2), the insulating skirt (3) and the elastic damping element (4) are bonded together by adhesive.

7. A post insulator according to claim 1 or 2, characterized in that, The insulating umbrella skirt (3) is made of silicone rubber.

8. A post insulator, comprising a first core rod (1) and an elastic insulating shed (3), characterized in that, The post insulator also includes a second core rod (2) and an elastic damping element (4). The first core rod (1) and the second core rod (2) are both fixed in the insulating shed (3). The elastic damping element (4) passes through the insulating shed (3) and is located between the first core rod (1) and the second core rod (2). The elastic damping element (4) is fixedly connected to both the first core rod (1) and the second core rod (2). The elastic damping element (4) allows the first core rod (1) and the second core rod (2) to move relative to each other along the axial direction of the insulating shed (3). The elastic damping element (4) includes an elastic body ( 41) and a flexible metal ring (42) embedded in the main body (41), the main body (41) being fixedly connected to the first core rod (1) and the second core rod (2), the cross-section of the metal ring (42) being rectangular or square, two sides of the metal ring (42) being perpendicular to the axial direction of the insulating skirt (3), and the other two sides of the metal ring (42) being parallel to the axial direction of the insulating skirt (3), the elastic damping element (4) being integrally formed by injection molding, the main body (41) covering the metal ring (42), and the main body (41) filling the interior of the metal ring (42).

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