JP2000149687A - Bushing device provided with inner surface fouling preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulation tube device provided with an inner surface fouling preventing device capable of reducing the water content in a supply air at the pre-stage supplied to the inside of an insulation tube and certainly preventing a fear of an inner surface flash passage. SOLUTION: A flange fitting 31 is mounted to a lower end of a glass tube 1 making the inside thereof to an air flow passage 11 for an instrument operation and the bushing 1 is mounted and fixed to a roof surface 34 of a vehicle such as an electric railcar through a mounting base 32. A moisture removing chamber 4 is continuously provided in the lower portion of the bushing 1 and an air supply port 41 to which an air piping 61 is connected is provided on the moisture removing chamber 4. A capillary tube aggregate 5 formed by superposing many capillary tubes is accommodated in the moisture removing chamber 4 and a supply air is passed through the capillary tube 5 and is fed to the air passage 11 of the bushing 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porcelain tube device provided with a device for preventing contamination of an inner surface used for a pantograph support of a train or the like.

[0002]

2. Description of the Related Art A hollow porcelain insulator is used in an insulator device for insulating and supporting a pantograph of a train to which a voltage of several tens of kV is applied because compressed air for operating the pantograph to move up and down is required. However, the air for operating the pantograph is supplied from the on-board compressor, but it is not always possible to use clean air.
Since dirty or moist air may be sent to the porcelain tube, the inner surface of the porcelain tube is easily contaminated, and there is a risk of flashing of the inner surface depending on use conditions, weather conditions, and the like.

[0003] In order to improve the inner surface contamination performance of such an insulator tube and to increase the effective length of the insulator tube to eliminate the risk of internal flashover, there are restrictions on the dimensions of the vehicle and the overhead wire, and the insulator tube is not suitable. If the height is increased, the wind noise increases and causes noise, so that it is difficult to adopt it. Further, the surface leakage distance can be increased by a usual technique such as providing a shade on the outer surface of the porcelain tube, but it is difficult to provide a shade on the inner surface of the porcelain tube.

[0004] The applicant of the present invention has proposed the insulator tube device described below in Japanese Patent Application No. 9-301725, which has been disclosed in Japanese Patent Application No. 9-301725, in order to solve the problem of the insulator device for insulating and supporting the pantograph. Has proposed an improved structure. In the first case, a metal upper plate 12 and a lower plate 13 are attached to the lower and upper ends of a porcelain insulator 1 as shown in FIG. A passage 14 is formed, the end of which is connected to a connection port 15 of the pipe.
The upper plate 12 is provided with an upper connection port 16 communicating with a pantograph or the like. A feature is that a water-repellent elastomer layer 21 made of a silicon-based water-repellent is formed on the inner surface of the insulator tube 1.

In this case, a simple structure in which a water-repellent elastomer layer 21 is formed on the inner surface of the insulator tube 1
The wet contaminants in the air are less likely to adhere to the inner surface of the porcelain tube 1, and if they adhere, they will be spherical and will not form a continuous soiling film that causes creeping flashover. In this manner, the performance of preventing the inner surface of the porcelain tube 1 from being contaminated is greatly improved, and the internal flashing can be prevented.

In the second case, as shown in FIG. 3, a spiral air hose 22 made of insulating polyurethane or the like, which serves as an air flow path for operating equipment, is provided inside a porcelain insulator tube 1. And upper and lower ends thereof are connected to an upper connection port 16 of the upper plate 12 and an air flow path 14 of the lower plate 13. The air for operating the equipment is the spiral air hose 2
It is unavoidable that the inner surface of the porcelain 2 is contaminated due to the flow inside, but the surface leakage distance is 3 to 4 times the surface leakage distance of the inner surface of the insulator tube 1 because of the spiral shape. Can be. In this way, even if the inner surface of the spiral air hose 22 is soiled, the inner flash can be prevented.

In the case described above, although effective when the supplied air is of a normal degree of contamination, it is necessary to develop means for reliably preventing internal flashover even when the degree of contamination is high. Had been requested.

[0008]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and reduces the water content in the supply air before it is supplied to the inside of the porcelain tube. It is an object of the present invention to provide a porcelain tube device provided with an inner surface contamination prevention device capable of reliably preventing the occurrence of a porosity.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an insulator pipe device provided with an inner surface contamination preventing device according to the present invention comprises an insulator tube having an air flow passage for operating equipment in a moisture removal chamber. In a porcelain tube device connected continuously, an air supply port is provided in the moisture removal chamber, and a large number of thin tubes are stacked and stored, and supply air passes through the group of thin tubes and is supplied to the insulator tube side. It is characterized by the following.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a porcelain pipe device provided with an inner surface contamination preventing device according to the present invention will be described with reference to FIG. In FIG. 1, a flange metal fitting 31 is attached to a lower end portion of an insulator tube 1 having an air passage 11 for device operation, and the insulator tube 1 is connected to a vehicle roof surface 34 of a train or the like via an attachment base 32. Attached and fixed. An upper portion (not shown) of the insulator tube 1 is connected to a device such as a pantograph, and is configured so that operation air is supplied through an air flow path 11.

A feature of the present invention is that a water removing chamber 4 is connected to a lower portion of the insulator tube 1 and an air supply port 41 to which an air pipe 61 is connected is provided in the water removing chamber 4. And a thin tube assembly 5 in which many thin tubes are stacked
And the supply air is passed through the narrow tube assembly 5 and sent to the air flow path 11 of the insulator tube 1.

As the thin tube, for example, an inner diameter of 5 mm,
Many cylindrical stainless steel pipes with a wall pressure of about 0.3 mm,
In a bundled state, it is stored in the water removal chamber 4 as a thin tube aggregate 5. In this case, the air supply port 4 provided in the moisture removal chamber 4
The openings of the capillary tube assembly 5 are arranged so as to face each other at a slight distance from 1. Then, air flows from the outlet side of the thin tube assembly 5 toward the air flow path 11 of the insulator tube 1.

[0013] The size, number of tubes, material and the like of the thin tubes are not particularly limited, but stainless steel, brass, and other copper alloy pipe materials are taken into consideration in consideration of moisture removal efficiency, clogging by fouling substances, corrosion, and the like. You can choose from.

The water removing chamber 4 is preferably made of metal which sufficiently withstands the driving vibration of the vehicle and does not cause air leakage, and the lower bottom plate portion 44 is provided with drain water accumulated therein. A drain vent 45 for extracting the drain is provided. In FIG. 1, the upper surface plate portion 43 forming the moisture removing chamber 4 is fixed to the flange metal fitting 31 with a bolt and a nut while closely contacting the lower surface of the insulator tube 1 with a seal gasket 44 interposed therebetween. The moisture removal chamber 4 may be provided independently as a storage case.

According to the porcelain device of the present invention, the compressed air for operating the equipment is first introduced into the moisture removing chamber 4 and dispersed into the gaps of the thin tube aggregates housed therein to enter and pass therethrough. However, as it passes through the interior of the individual capillaries and the gaps between them, water in the form of fine water droplets in the air is removed by adhering to the inner and outer side walls of the capillaries. Then, excess water may be drained in a timely manner as drain water.

In the conventional structure, when compressed air for operating equipment is fed into the porcelain tube, if the air contains a large amount of contaminated water, the air flows upward from the air inlet. As a result, a phenomenon occurs in which the fouled water becomes a spray water column and extends, and the fouled water itself acts as a conductor,
A flash accident could occur. This phenomenon is particularly problematic in the case of a pantograph supporting insulator when a voltage is applied as in a pantograph lowering operation.

With respect to such a problem, according to the present invention,
The water is removed by the thin tube assembly, and the air flow is dispersed and bent to be sent to the air passage 11 of the insulator tube 1.
Thus, it is possible to effectively prevent the flashover accident from occurring.

Further, in the arrangement of the thin tube assembly 5, an arrangement in which the outlet of the air passing through the thin tube assembly 5 is directly directed to the air flow path 11 of the insulator tube 1 should be avoided, as shown in FIG. It is preferable to arrange each member such as a porcelain tube, a moisture removal chamber, and a tubule aggregate so that the air that has passed through the thin tube assembly 5 is bent and then sent to the air flow path 11 of the insulator tube 1. It is more preferable to form a water-repellent elastomer layer on the inner surface of the air passage 11 of the porcelain tube 1 because the stain resistance can be greatly improved.

[0019]

According to the porcelain device provided with the apparatus for preventing contamination of the inner surface of the present invention, as described above, the moisture in the compressed air for operating the equipment can be reduced in advance. Since air with less pollutants can be supplied to the inside of the device, internal flashover can be reliably prevented. Further, since the flow of the supply air is dispersed, there is an excellent effect that the spoiled water can be suppressed from being spouted into the insulator tube. Therefore, the present invention has a very large industrial value as a porcelain tube device provided with an inner surface contamination prevention device which solves the conventional problems.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part for describing an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a conventional porcelain pipe device.

FIG. 3 is a cross-sectional view of a main part of an insulator pipe device according to another conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Insulator tube, 11 Air flow path, 31 Flange fitting, 32
Mounting stand, 34 Vehicle roof surface, 4 Moisture removal room, 4
1 air supply port, 43 top plate, 44 seal gasket, 45 drainage, 5 small tube assembly, 61 air piping.

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Claims (1)

[Claims] A porcelain tube device in which an insulator tube having an internal air passage for operating equipment is connected to a moisture removal chamber, wherein the moisture removal chamber is provided with an air supply port and a number of thin tubes are stacked. A porcelain device provided with an inner surface contamination prevention device, wherein supply air is supplied to the porcelain tube side through the narrow tube group.