Pantograph support insulator

Abstract

The invention provides a pantograph supporting insulator, which relates to the field of pantograph accessories and comprises a flange base, a core column is mounted at the upper end of the flange base, a plurality of umbrella skirts are arranged on the outer side of the core column, a cavity quadrangular cone is arranged in the core column, and an insulating gas pipe of a straight pipe section and a spiral pipe section which are communicated together is further arranged in the core column. Wherein the spiral pipe section is arranged on the cavity quadrangular cone, the free end of the spiral pipe section is connected with a lower air pipe joint arranged on the outer wall of the flange base, the lower air pipe joint can be connected with an air source air pipe in a motor train unit body, and the free end of the straight pipe section is connected with an upper air pipe joint on the outer wall of the core column. And the upper air pipe joint can be connected with an air pipe of the pantograph. According to the gas channel with a special shape, the pantograph rising response speed of the motor train unit is increased, and meanwhile, the arc flash distance in the insulating gas pipe is effectively increased, so that the insulator can still meet the technical requirement of rated lightning impulse withstand voltage of 185kV after being broken down by lightning impulse voltage.

Description

Technical Field

[0001] The invention relates to the field of pantograph accessories, in particular to a pantograph supporting insulator. Background Art

[0002] China's rapid railway construction has driven the rapid localization of electric locomotives and EMU trains. The air supply for raising the pantograph on the roof of an EMU train is transported from the train body through a high-pressure air duct on the roof to the pantograph's airbag. This high-pressure air duct is vertically exposed to the outside world, making it susceptible to damage from foreign objects. To address the risk of damage from the high-pressure air duct exposed vertically on the roof, a pantograph support insulator with a built-in insulating air duct, low wind resistance, and low noise is urgently needed to ensure the safe operation of high-speed EMU trains. Summary of the Invention

[0003] In order to solve the problem that the high-voltage air duct is easily damaged when vertically exposed on the roof, the present invention provides a pantograph supporting insulator.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a pantograph support insulator, including a flange base, the lower end of the flange base is fixed on the roof base, a core column is installed on the upper end of the flange base, a high-voltage terminal is embedded in the upper end of the core column, a number of annular umbrella skirts are provided on the outside of the core column, a coaxial hollow quadrangular cone is provided inside the core column, and an insulating air pipe is also provided in the above-mentioned core column, the insulating air pipe includes a straight pipe section and a spiral pipe section connected together, wherein the spiral pipe section is arranged on the hollow quadrangular cone, the free end of the spiral pipe section is connected to the downwind pipe joint arranged on the outer wall of the flange base, and the downwind pipe joint can be connected to the air duct of the air source in the EMU car body, the free end of the straight pipe section of the above-mentioned insulating air pipe is connected to the upwind pipe joint on the outer wall of the core column, and the upwind pipe joint can be connected to the air duct of the pantograph.

[0005] Specifically, the upper duct joint is connected to the straight pipe section of the insulating air duct through the upper duct insert; the core column is an elliptical cone structure, and the upper duct insert is located on the elliptical major axis of the upper end face of the core column; the lower duct joint is connected to the spiral pipe section of the insulating air duct through the lower duct insert.

[0006] A further improvement is that the umbrella skirt includes large umbrella skirts and small umbrella skirts that are alternately distributed up and down.

[0007] A further improvement is that the large shed and the small shed are elliptical; the downward inclination angle of the large shed is in the range of 9°-15°, and the downward inclination angle of the small shed is in the range of 9°-15°, which can reduce the flashover phenomenon caused by dust collection on the insulator.

[0008] As a further improvement, two ribs are provided in the direction of the elliptical minor axis at the bottom of the core column to strengthen the mechanical strength of the connection between the core column and the flange base.

[0009] Preferably, the flange base is a rounded rectangular structure, and the downpipe insert is located on one side of the rounded rectangle.

[0010] As a further improvement, a blind hole is provided in the middle of the flange base, a cavity frustum is fixed in the blind hole, and the lower part of the cavity quadrangular cone is fixed on the cavity frustum.

[0011] Specifically, the lower portion of the spiral tube section of the insulating air pipe is seated on the conical cone of the cavity.

[0012] Specifically, the four corners of the flange base are provided with flange inserts, and the flange base is fixed to the roof base by bolts in the flange inserts.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The specially shaped gas passageway, connecting a straight insulating air duct with a spiral insulating air duct, leverages fluid mechanics to accelerate the EMU's pantograph response time while effectively increasing the arc flash distance within the insulating air duct. This ensures that even after being struck by a lightning impulse voltage, the insulator still meets the technical requirement of a rated lightning impulse withstand voltage of 185kV. The combination of a hollow quadrangular cone and a hollow truncated cone enhances the insulator's internal structure's bending resistance, allowing it to withstand horizontal lateral loads of 16kN, horizontal longitudinal loads of 16kN, and tensile loads of 60kN without damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the structural front view of the present invention.

[0015] Figure 2 It is a structural side view of the present invention.

[0016] Figure 3 It is a top view of the structure of the present invention.

[0017] Figure 4 It is a bottom view of the structure of the present invention.

[0018] Figure 5 It is a structural diagram of the combination of the hollow quadrangular pyramid and the hollow circular truncated cone of the present invention.

[0019] Figure 6 yes Figure 5 Cross-sectional view of section A-A.

[0020] Markings in the figure: 1. High-voltage terminal; 2. Upstream duct joint; 3. Upstream duct insert; 4. Core column; 5. Large umbrella skirt; 6. Small umbrella skirt; 7. Cavity quadrangular cone; 8. Insulated air pipe; 8-1. Straight pipe section; 8-2. Spiral pipe section; 9. Downstream duct joint; 10. Downstream duct insert; 11. Flange insert; 12. Cavity frustum; 13. Rib plate; 14. Flange base. DETAILED DESCRIPTION

[0021] The present invention will be further explained and illustrated below with reference to the accompanying drawings and embodiments.

[0022] Example: Figure 1 and Figure 2 As shown, a pantograph support insulator provided by the present invention includes a flange base 14, the lower end of the flange base 14 is fixed on the roof base, a core column 4 is installed on the upper end of the flange base 14, a high-voltage terminal 1 is embedded in the upper end of the core column 4, a plurality of annular umbrella skirts are provided on the outside of the core column 4, a coaxial hollow quadrangular cone 7 is provided inside the core column 4, and an insulating air pipe 8 is also provided in the core column 4, the insulating air pipe 8 includes a straight pipe section 8-1 and a spiral pipe section 8-2 connected together to form a vertical gas channel of a special shape; wherein the spiral pipe section 8-2 is provided on the hollow quadrangular cone 7, the free end of the spiral pipe section 8-2 is connected to the downwind pipe joint 9 provided on the outer wall of the flange base 14, the downwind pipe joint 9 can be connected to the air duct of the air source in the EMU car body, the free end of the straight pipe section 8-1 of the insulating air pipe is connected to the upwind pipe joint 2 on the outer wall of the core column 4, the upwind pipe joint 2 can be connected to the air duct of the pantograph.

[0023] Furthermore, the free end of the spiral section 8-2 of the insulating air duct is connected to the downpipe connector 9 via the downpipe insert 10. The downpipe connector 9 is mounted on a flange base 14 and connected to the air source duct inside the EMU body. The free end of the straight section 8-1 of the insulating air duct is connected to the uppipe connector 2 via the uppipe insert 3. The uppipe connector 2 is connected to the pantograph's air duct, forming a complete air circuit. High-pressure gas can be transported from the body of the vehicle to the roof pantograph via the insulator's insulated air duct 8, or it can flow back from the pantograph into the body of the vehicle via the insulator's insulated air duct 8.

[0024] like Figure 2 、 Figure 5 、 Figure 6As shown, the spiral section 8-2 of the insulating air duct is evenly contoured around the hollow quadrangular pyramid 7. The bottom of the spiral section 8-2 rests on the hollow truncated cone 12. The four edges of the hollow quadrangular pyramid 7 and the hollow truncated cone 12 provide stable positioning for the spiral section 8-2. The conical shape of the spiral section 8-2 effectively increases the creepage distance within the air duct and improves internal overvoltage resistance. Due to the fluid dynamics of high-pressure gas, when the high-pressure gas within the EMU body passes through the insulating air duct 8, it accelerates its flow and rapidly transports it to the pantograph airbag, accelerating the pantograph raising response. The linear design of the straight section 8-1 of the insulating air duct effectively increases the arc flash distance within the air duct and improves the lightning impulse withstand voltage (rated lightning impulse withstand voltage is 185 kV). After a breakdown in a simulated lightning impulse withstand voltage test, the rated lightning impulse withstand voltage can still meet the 185 kV requirement when reapplied, significantly enhancing the electrical insulation safety of high-speed EMU trains.

[0025] like Figure 1 、 Figure 2 As shown, the core column 4 is an elliptical cone structure, the lower end surface is larger than the upper end surface, and the bottom center is composed of a hollow quadrangular pyramid 7 and a hollow truncated cone 12 to increase the bending resistance. Figure 4 As shown, the bottom of the core column 4 is a flange base 14, which is a rounded rectangular structure. The downpipe insert 10 is located on one side of the rounded rectangle. Four flange inserts 11 are evenly distributed at the four corners of the flange base 14. The flange inserts 11 have an anti-rotation and anti-pullout structural design. The flange base 14 is fixed to the roof base by bolts inside the flange inserts 11. Two ribs 13 are provided in the direction of the minor axis of the ellipse at the bottom of the core column 4 to enhance the mechanical strength of the connection between the core column 4 and the flange base 14. In this way, when external force is applied to the high-voltage terminal 1, the insulator can withstand external forces of 16kN horizontal lateral load, 16kN horizontal longitudinal load, 60kN tensile load, 45kN compressive load, and 1000N·m torsional load without being damaged, meeting the mechanical safety requirements during the operation of the high-speed EMU.

[0026] like Figure 3 As shown, the upper end face of the core 4 is elliptical, with the upper air duct insert 3 located on the major axis of the ellipse on the upper end face of the core 4. The large sheds 5 (five layers) and small sheds 6 (four layers) are elliptical and spaced from top to bottom on the elliptical cross-section of the core 4. This increases the insulator's external creepage distance and improves its external power frequency withstand voltage and lightning impulse withstand voltage. Each shed has a downward inclination angle ranging from 9° to 15°, with the extension of the large sheds 5 and small sheds 6 differing by 15-18mm. This elliptical shed-shaped, elliptical cone core design optimizes wind resistance and reduces noise during high-speed EMU operation. A reasonable shed inclination significantly reduces dust accumulation on the leeward side, improving the support insulator's pollution flashover resistance.

[0027] The present invention is described by way of example, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the teachings of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be within the scope of the present invention.

Claims

1. A pantograph support insulator, characterized by: The invention comprises a flange base (14), the lower end of the flange base (14) is fixed on the roof base, the upper end of the flange base (14) is provided with a core column (4), the upper end of the core column (4) is embedded with a high-voltage terminal (1), the outer side of the core column (4) is provided with a plurality of annular umbrella skirts, the interior of the core column (4) is provided with a coaxial hollow quadrangular cone (7), the core column (4) is further provided with an insulating air pipe (8), the insulating air pipe (8) comprises a straight pipe section (8-1) and a spiral pipe section (8-1) connected together. -2), wherein the spiral pipe section (8-2) is arranged on the cavity quadrangular cone (7), the free end of the spiral pipe section (8-2) is connected to the downwind pipe joint (9) arranged on the outer wall of the flange base (14), and the downwind pipe joint (9) can be connected to the air duct of the air source in the EMU car body, and the free end of the straight pipe section (8-1) of the insulating air pipe is connected to the upwind pipe joint (2) on the outer wall of the core column (4), and the upwind pipe joint (2) can be connected to the air duct of the pantograph.

2. The pantograph support insulator according to claim 1, characterized in that: The upper air duct joint (2) is connected to the straight pipe section (8-1) of the insulating air duct through the upper air duct insert (3); the core column (4) is an elliptical cone structure, and the upper air duct insert (3) is located on the elliptical major axis of the upper end surface of the core column (4); the lower air duct joint (9) is connected to the spiral pipe section (8-2) of the insulating air duct through the lower air duct insert (10).

3. The pantograph support insulator according to claim 1, characterized in that: The umbrella skirt comprises a large umbrella skirt (5) and a small umbrella skirt (6) which are alternately distributed up and down.

4. The pantograph support insulator according to claim 3, characterized in that: The downward inclination angle of the large umbrella skirt (5) is in the range of 9°-15°, and the downward inclination angle of the small umbrella skirt (6) is in the range of 9°-15°.

5. The pantograph support insulator according to claim 3, characterized in that: The large umbrella skirt (5) and the small umbrella skirt (6) are oval in shape.

6. The pantograph support insulator according to claim 1, characterized in that: Two ribs (13) are provided in the direction of the elliptical minor axis at the bottom of the core column (4).

7. The pantograph support insulator according to claim 1, characterized in that: The flange base (14) is a rounded rectangular structure, and the downpipe insert (10) is located on one side of the rounded rectangle.

8. The pantograph support insulator according to claim 1, characterized in that: A blind hole is provided in the middle of the flange base (14), and a cavity frustum (12) is fixed in the blind hole. The lower part of the cavity quadrangular cone (7) is fixed on the cavity frustum (12).

9. The pantograph support insulator according to claim 8, characterized in that: The lower part of the spiral pipe section (8-2) of the insulating air pipe is seated on the cavity frustum (12).

10. The pantograph support insulator according to claim 1, characterized in that: The four corners of the flange base (14) are provided with flange inserts (11), and the flange base (14) is fixed to the roof base through bolts in the flange inserts (11).

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