A self-sealing transfer device for GIS or GIL

Abstract

The application belongs to the field of switching devices, and provides a self-sealing switching device for GIS or GIL, which comprises a valve seat, a valve core arranged in the valve seat, the valve core comprising a core shaft, a thimble connected to the lower end of the core shaft, a conical boss with a downward taper arranged on the upper end outer side surface of the thimble, a conical stop ring with an upward taper arranged on the middle part of the inner side surface of the valve seat and matched with the conical boss; a valve core fixing member arranged on the upper part of the inner side surface of the valve seat, the core shaft penetrating through the valve core fixing member, a spring arranged between the lower end surface of the valve core fixing member and the thimble; at least one sealing ring fixing groove arranged on the lower part of the inner side surface of the valve seat, and an O-shaped sealing ring arranged in each sealing ring fixing groove. The self-sealing switching device for GIS or GIL can avoid metal dust generated in the docking process from entering the interior of the equipment, and ensure the safe and reliable operation of the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to a switching device, in particular to a self-sealing switching device for GIS or GIL. BACKGROUND

[0002] GIS (gas insulated metal enclosed switchgear) and GIL (gas insulated metal enclosed transmission line) are high voltage and high current power transmission devices which are insulated by SF6 or other gas and have coaxial arrangement of housing and conductor.

[0003] The self-sealing switching device is widely used in GIS / GIL equipment for vacuum and gas filling operation. The self-sealing switching device is connected with the self-sealing valve on the GIS / GIL through threads. Metal powder will be generated during the screwing process. If no measures are taken, the metal powder will be sucked into the GIS / GIL along with the gas flow. During the movement of the particles, the particles may be adsorbed on the basin type insulator or other weak electric field positions, causing internal breakdown of the GIS / GIL. SUMMARY

[0004] The purpose of the present application is to overcome the existing defects and provide a self-sealing switching device for GIS or GIL, which solves the problem that the current self-sealing switching device cannot prevent metal powder from entering the equipment.

[0005] In order to solve the above technical problems, the present application provides the following technical solutions:

[0006] A self-sealing switching device for GIS or GIL, comprising a valve seat, a valve core is arranged in the valve seat, the valve core comprises a core shaft, a thimble is connected to the lower end of the core shaft, a conical boss with a downward taper is arranged on the outer side of the upper end of the thimble, a conical stop ring with an upward taper is arranged on the middle part of the inner side of the valve seat and matches the conical boss; a valve core fixing member is arranged on the upper part of the inner side of the valve seat, the core shaft penetrates through the valve core fixing member, and a spring is arranged between the lower end surface of the valve core fixing member and the thimble; at least one sealing ring fixing groove is arranged on the lower part of the inner side of the valve seat, and an O-shaped sealing ring is arranged in each sealing ring fixing groove.

[0007] Further, an external thread is arranged on the upper end of the valve seat, and an internal thread is arranged on the lower end of the valve seat.

[0008] Further, a wear-resistant adhesive coating is coated on the external thread and the internal thread.

[0009] Further, a contact sealing member is arranged on the contact surface of the conical stop ring and the conical boss.

[0010] Further, two sealing ring fixing grooves are arranged.

[0011] Furthermore, a ring-shaped protrusion is provided on the end face of the valve seat that mates with the self-sealing valve.

[0012] This invention provides a self-sealing adapter for GIS or GIL, which can prevent metal dust generated during the docking process from entering the equipment and ensure the safe and reliable operation of the equipment. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a schematic diagram of the structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the structure of the present invention after being connected with a self-sealing valve. Detailed Implementation

[0016] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0017] like Figure 1 , 2 As shown, a self-sealing adapter for GIS or GIL includes a valve seat 1, a valve core inside the valve seat 1, the valve core including a spindle 2, a pin 3 connected to the lower end of the spindle 2, a conical boss 4 with its conical surface facing downwards on the outer side of the upper end of the pin 3, a conical retaining ring 5 with its conical surface facing upwards matching the conical boss 4 in the middle of the inner side of the valve seat 1; a valve core fixing member 6 is provided on the upper part of the inner side of the valve seat 1, the spindle 2 passes through the valve core fixing member 6, a spring 7 is provided between the lower end face of the valve core fixing member 6 and the pin 3; at least one sealing ring fixing groove is provided on the lower part of the inner side of the valve seat 1, and an O-ring 8 is provided in each sealing ring fixing groove.

[0018] Working principle:

[0019] Normally, under the action of the spring, the conical boss of the ejector pin and the conical retaining ring inside the valve seat are tightly fitted, closing the airflow passage. When activation is required, the ejector pin, under external force, compresses the spring, causing the conical boss to disengage from the conical retaining ring, thus opening the airflow passage. During this process, the valve core retainer acts as a limit, preventing the valve core from detaching from the valve seat. When the valve seat is connected to the self-sealing valve A, before tightening the threads, the upper outer wall of the self-sealing valve first engages with the O-ring seal, ensuring that metal dust and particles generated during the threading process do not enter the valve seat.

[0020] The conical retaining ring 5 has a contact seal 9 on its contact surface with the conical boss 4 to enhance sealing and reduce wear.

[0021] The sealing ring fixing groove is provided with two rows, preventing single row sealing failure and affecting the sealing effect.

[0022] A ring-shaped protrusion 10 is arranged on the end face of the valve seat 1 which is connected with the self-sealing valve A, and after the valve seat is connected with the self-sealing valve, a closed space B is formed outside the ring-shaped protrusion, which can accommodate metal powder and particles generated in the screwing process.

[0023] An outer thread 11 is arranged at the upper end of the valve seat 1 for connecting with the vent pipe, and an inner thread 12 is arranged at the lower end of the valve seat 1 for connecting with the self-sealing valve on the GIS or GIL.

[0024] A wear-resistant adhesive coating is coated on the outer thread 11 and the inner thread 12, which can effectively protect the threads and reduce the generation of metal powder in the screwing process.

[0025] The self-sealing adapter for GIS or GIL can avoid the entry of metal powder generated in the connecting process into the equipment, and ensure the safe and reliable operation of the equipment.

[0026] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the foregoing embodiments of the present application are described in detail, for the skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A self-sealing transfer device for use in a GIS or GIL, characterized by: The valve seat is internally provided with a valve core, the valve core comprises a core shaft, the lower end of the core shaft is connected with a thimble, the upper end of the thimble is externally provided with a conical boss with a downward taper, and the middle part of the inner side of the valve seat is provided with a conical stop ring with an upward taper matched with the conical boss; The upper part of the inner side of the valve seat is provided with a valve core fixing part, the core shaft penetrates through the valve core fixing part, and a spring is arranged between the lower end surface of the valve core fixing part and the thimble; The lower part of the inner side of the valve seat is provided with at least one sealing ring fixing groove, and each sealing ring fixing groove is internally provided with an O-shaped sealing ring; A ring-shaped protrusion is arranged on the end surface of the valve seat which is internally connected with the self-sealing valve, the ring-shaped protrusion abuts on the end surface of the self-sealing valve after the valve seat is connected with the self-sealing valve through threads, and a closed space is formed on the outer side of the ring-shaped protrusion.

2. A self-sealing transfer device for use in a GIS or GIL according to claim 1, characterized in that: The upper end of the valve seat is provided with external threads, and the lower end of the valve seat is provided with internal threads.

3. A self-sealing transfer device for use in a GIS or GIL according to claim 2, characterized in that: A wear-resistant adhesive coating is coated on the external threads and the internal threads.

4. A self-sealing transfer device for use in a GIS or GIL according to claim 1, characterized in that: The conical stop ring is provided with a contact sealing part on the contact surface of the conical boss.

5. A self-sealing transfer device for use in a GIS or GIL according to claim 1, characterized in that: The sealing ring fixing groove is provided with two rows.

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