Sealing structure of post insulator

Abstract

The sealing structure comprises an umbrella cover, a pulling rod and a flange, the umbrella cover is formed on the pulling rod in a vulcanization mode, the flange is installed at the end of the pulling rod, a first sealing groove is formed in the inner wall face of the flange, the umbrella cover is formed by hot vulcanization silicone rubber in a vulcanization mode, and a second sealing groove is formed in the inner wall face of the flange. The silicon rubber flows into the first sealing groove and forms sealing between the flange and the drawing rod; the silicone rubber wraps the end face of the flange to form sealing between the umbrella cover and the flange. According to the utility model, the sealing structure is formed by one-time injection molding, each interface is coated with a coupling agent, so that the sealing structure has good bonding strength, the silicon rubber is embedded into the flange and wraps the exterior of the drawing rod, and the sealing structure is formed by one-time molding during molding, so that moisture can be effectively prevented from entering the insulator.

Description

Technical Field

[0001] This utility model relates to a sealing structure for a post insulator. Background Technology

[0002] Traditional sealing uses room temperature vulcanized silicone rubber to seal between the three interfaces of silicone rubber sheath, pull rod and flange. This material is prone to aging outdoors, and its outdoor service life is generally about 5 to 8 years before it fails. As a result, water can easily accumulate in the lower flange and seep into the insulator, damaging the insulation inside the insulator. Summary of the Invention

[0003] This utility model provides a sealing structure for a post insulator to solve the problems existing in the prior art.

[0004] The technical solutions adopted in this utility model are as follows:

[0005] A sealing structure for a post insulator includes a shed, a pull rod, and a flange. The shed is vulcanized on the pull rod, and the flange is installed at the end of the pull rod. A first sealing groove is provided on the inner wall surface of the flange. The shed is vulcanized from hot-cured silicone rubber. The silicone rubber flows into the first sealing groove and forms a seal between the flange and the pull rod. The silicone rubber covers the end face of the flange to form a seal between the shed and the flange.

[0006] Furthermore, a stepped portion is provided on the bore wall of the flange, and the stepped portion forms the first sealing groove between the inner wall surface of the stepped bore and the outer wall surface of the pull rod. The depth of the first sealing groove is at least 1 / 2 of the axial height of the flange.

[0007] Furthermore, a second sealing groove is provided on the outer wall surface of the flange port, and a second step is provided on the inner end face. After the silicone rubber is wrapped around the end face of the flange, a labyrinth-type sealing structure is formed between the second sealing groove, the second step and the umbrella sleeve.

[0008] Furthermore, the first sealing groove is provided with several annular grooves arranged with equal gaps.

[0009] Furthermore, the bonding interfaces of the umbrella sleeve, the pull rod, and the flange are coated with a silane coupling agent.

[0010] Furthermore, the outer wall of the flange is provided with an injection hole and an vent hole.

[0011] This utility model has the following beneficial effects:

[0012] The sealing structure of this invention is injection molded in one go, and a coupling agent is applied to each interface to give it good adhesion strength. Silicone rubber is embedded inside the flange and wraps the outside of the pull rod. It is formed in one go during molding, which can effectively prevent moisture from entering the insulator. Attached Figure Description

[0013] Figure 1 is a structural diagram of this utility model.

[0014] Figure 2 is a structural diagram of this utility model. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] like Figure 1 and Figure 2 This utility model discloses a sealing structure for a post insulator, comprising a shed 1, a pull rod 2, and a flange 3. A first sealing groove 30 is provided on the inner wall surface of the flange 3. The shed 1 is formed by hot vulcanized silicone rubber (HTV). The silicone rubber flows into the first sealing groove 30 and forms a seal between the flange 3 and the pull rod 2. The silicone rubber covers the end face of the flange 3 to form a seal between the shed 1 and the flange 3.

[0017] A stepped portion 31 is provided on the bore wall of flange 3. The stepped portion 31 forms a first sealing groove 30 between the inner wall surface of the stepped bore and the outer wall surface of the pull rod 2. The depth of the first sealing groove 30 is at least 1 / 2 of the axial height of flange 3. Silicone rubber enters between pull rod 2 and flange 3 to ensure sealing. Several annular grooves 34 with equal spacing are provided in the first sealing groove 30. The annular grooves 34 can increase the contact area between umbrella sleeve 1 and flange 3. The silicone rubber entering the annular grooves 34 can ensure the sealing effect on the one hand, and increase the assembly fastening force between umbrella sleeve 1 and flange 3 on the other hand.

[0018] To further ensure sealing, a second sealing groove 32 is provided on the outer wall surface of the flange 3 port, and a second step portion 33 is provided on the inner end face. After the silicone rubber is wrapped around the end face of the flange 3, a labyrinth-type sealing structure is formed between the second sealing groove 32, the second step portion 33 and the umbrella sleeve 1.

[0019] A silane coupling agent is applied to the bonding interface of the umbrella sleeve 1, the pull rod 2, and the flange 3. The sealing structure of this utility model adopts a one-time molding seal of high-temperature vulcanized silicone rubber (HTV) and the umbrella sleeve. Since the sealing area is molded under high temperature and high pressure, and a coupling agent is applied to the bonding interface, the seal can be firmly bonded to the connection interface of the flange and the insulating pipe.

[0020] The outer wall of flange 3 is provided with a glue injection hole 35 and a vent hole 36. The seal between flange 3 and pull rod 2 can be formed directly by injecting silicone rubber into glue injection hole 35. The final seal formed here is integrally formed with umbrella sleeve 1 (the umbrella sleeve is formed by pouring silicone rubber into the mold outside the pull rod).

[0021] During use, the path for moisture to enter the insulator is as follows: Figure 2The gray lines in the diagram illustrate that if moisture wants to enter the insulator, it must take a roundabout path. The sealing design includes multiple concave and convex mating surfaces (i.e., the second sealing groove, the second step, and the annular groove), which increases the resistance to moisture entering the insulator. The sealing effect is significantly better than the existing structure, resulting in better performance.

[0022] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.

Claims

1. A sealing structure for a post insulator, comprising a shed (1), a pull rod (2), and a flange (3), wherein the shed (1) is vulcanized on the pull rod (2), and the flange (3) is installed at the end of the pull rod (2), characterized in that: The inner wall of the flange (3) is provided with a first sealing groove (30). The umbrella sleeve (1) is formed by hot vulcanization of silicone rubber. The silicone rubber flows into the first sealing groove (30) and forms a seal between the flange (3) and the pull rod (2). The silicone rubber covers the end face of the flange (3) to form a seal between the umbrella sleeve (1) and the flange (3).

2. The sealing structure of the post insulator as described in claim 1, characterized in that: A stepped portion (31) is provided on the bore wall of the flange (3). The stepped portion (31) forms the first sealing groove (30) between the inner wall surface of the stepped bore and the outer wall surface of the pull rod (2). The depth of the first sealing groove (30) is at least 1 / 2 of the axial height of the flange (3).

3. The sealing structure of the post insulator as described in claim 1, characterized in that: A second sealing groove (32) is provided on the outer wall surface of the flange (3) port, and a second step (33) is provided on the inner end face. After the silicone rubber is wrapped around the end face of the flange (3), a labyrinth-type sealing structure is formed between the second sealing groove (32), the second step (33) and the umbrella sleeve (1).

4. The sealing structure of the post insulator as described in claim 1, characterized in that: The first sealing groove (30) is provided with several annular grooves (34) arranged with equal gaps.

5. The sealing structure of the post insulator as described in claim 1, characterized in that: The bonding interfaces of the umbrella cover (1), the pull rod (2) and the flange (3) are coated with a silane coupling agent.

6. The sealing structure of the post insulator as described in claim 1, characterized in that: The outer wall of the flange (3) is provided with an injection hole (35) and an exhaust hole (36).

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