Down-conducting device for subway cars

Abstract

A down-discharge device for subway cars is part of the equipment for the electric power supply systems of subway cars and is designed to discharge current from the car's electrical circuits through the wheelset axle into the ground. The down-discharge device comprises a housing (1) with a cover (2), inside which is installed a brush holder (3), consisting of three sections (4), (5), (6), in which brushes (7) are removable and equipped with a mechanism (8) for pressing the brush. The device comprises one terminal electrical contact pad (17) for external connection, made on the upper surface of the brush holder (3), each section of which is provided with a vertical stop (11) to ensure free movement of the brush (7) in the brush holder (3) as it wears out, while on the cover (2) a projection (19) is made to protect the terminal (18) for connecting the cable to the car body, and on the outer surface of the body (1) along the perimeter of the flange recesses (9) are made to bypass the fastening elements on the axle box of the metro car bogie.The technical result of using the utility model is an increase in operational characteristics that ensure operational requirements for maintenance and repair. 1 clause, 4 figs.

Description

[0001] The utility model relates to rail vehicles, in particular, to equipment for power supply systems of subway cars, namely to grounding down-discharge devices of wheel pairs and is intended to discharge current from the car's electrical circuits through the axle of the wheel pair into the ground.

[0002] A down conductor (grounding device) is known, comprising a housing and a cover, installed through a sealing gasket. The housing of the down conductor houses a brush assembly, consisting of a brush holder, a clamping unit, and brushes. When installing the down conductor on the end of the wheelset axle, a disk is secured at the mounting location. A clamping device consisting of a coil spring and a locking device ensures secure contact between the brushes and the disk (see https: / / eltroll2.ru / metro / 81_765_E6.php, "Auxiliary electrical equipment of cars 81-765 / 81-766 / 81-767").

[0003] The known current collector does not provide the required reliability due to intensive wear of the brushes due to inconsistent clamping force.

[0004] The closest to the proposed utility model in terms of the set of essential features is a down-discharge device for subway cars, comprising a housing with a cover, inside which a brush holder is installed, consisting of three sections, in which a brush with a mechanism for pressing the brush, made in the form of a coil spring and a plate for fixing the coil spring are installed with the possibility of removing it, wherein the coil spring is made in the form of a strip, one end of which is fixed by means of a plate on the brush holder, and the second end is made in the form of at least two concentric circles and is installed with the possibility of acting on the brush, and on the cover there is an output for connecting a cable to the car body (see patent RU 76860 U1, IPC B 60L 5 / 12, publication date 10.10.2008).

[0005] This device does not provide the required reliability and maintainability due to the failure of the service personnel to comply with the operational requirements for maintenance and repair.

[0006] The objective of the proposed utility model is to create a down conductor device with increased reliability and operational characteristics that meet operational requirements for maintenance and repair.

[0007] The technical result of using the utility model is an increase in operational characteristics that ensure operational requirements for maintenance and repair.

[0008] The specified technical result is achieved in that the down-discharge device for subway cars contains a housing with a cover, inside which a brush holder is installed, in which brushes with a mechanism for pressing the brushes are installed, on the outer surface of the housing along the perimeter of the flange there are recesses for bypassing fastening elements on the axle box of the subway car bogie.

[0009] In addition, it is preferable that the flange has at least 6 rounded recesses to bypass the fasteners on the axle box of the subway car bogie.

[0010] The utility model is illustrated by drawings, where:

[0011] Fig. 1 shows a down-discharge device for subway cars, isometric view, general view;

[0012] in Fig. 2 - down-discharge device for metro cars, general view;

[0013] in Fig. 3 - section A-A in Fig. 2;

[0014] in Fig. 4 - a remote element with a vertical projection, in Fig. 3.

[0015] Current conductors (grounding devices) are designed to divert current from the subway car's electrical circuits through the wheelset axle to the ground (to the running rails, to which the negative terminal of the traction network power supply is connected). These are done by pressing metal-graphite brushes into the end face of the wheelset axle through the disc surface.

[0016] Down conductors (down conductors) are installed on the axleboxes of both motor and non-motorized subway car bogies—one down conductor per wheel pair. The down conductors are secured to the axlebox with bolts.

[0017] The down-discharge device for subway cars contains a housing 1 with a cover 2, inside which a brush holder 3 is installed, consisting of three sections 4, 5, 6, in which brushes 7 with a mechanism 8 for pressing the brush are installed in a removable manner.

[0018] Brushes 7 are made of metal-graphite material with dimensions 20X36X50.

[0019] Each brush 7 contains two current-carrying shunts with vibration-resistant sealing made in the form of a two-point crimping.

[0020] On the outer surface of the housing 1, along the perimeter of the flange, at least 6 rounded recesses 9 are made for bypassing the fastening elements on the axle box of the metro car bogie.

[0021] The presence of at least 6 rounded recesses 9 for bypassing fasteners on the axle box of a subway car bogie ensures increased reliability and operational characteristics, since it ensures control of the condition of the axle box fastening bolts: the absence of recesses when installing down conductors on the axle box led to the destruction of the flange parts of the housing and cover due to the use of impact wrenches.

[0022] Each section 4, 5, 6 of the brush holder 3 has a groove 10 for installing a brush and a mechanism for pressing the brush, made on the outer surface of the section along the entire length, and is provided with a vertical stop 11 to ensure free movement of the brush 7 in the brush holder as it wears out.

[0023] The vertical stop 11 is a structural continuation of the wall of the groove 10 of the brush holder 3 and is located on the opposite side of the mechanism 8 for pressing the brush,

[0024] ensures the absence of a transition boundary and allows for the unimpeded movement of the brush 7 and the mechanism 8 for pressing the brush across the boundary of the brush holder 3 to be maintained during the natural wear of the brushes 7, thereby ensuring the reliability and stability of the contact of the brushes 7 with the disk - the absence of "hanging" of the brushes 7, and thereby ensuring an increase in the reliability and performance characteristics of the down collector.

[0025] Between the body 1 and the cover 2, there is an insulating element 12, the insulating element 13 is located in front of the disk 14 on the opposite end of the body 1, the shape of the insulating elements is identical to the shape of the connecting surfaces of the body 1 and cover 2. Insulating elements 12, 13 are made of oil-resistant paronite, which further improves the reliability of the current collector.

[0026] Mechanism 8 for pressing the brush, made in the form of a roll spring 15 and a plate 16 for fixing the roll spring, wherein the roll spring 15 is made in the form of a strip, one end of which is fixed by means of a plate 16 on the brush holder 3, and the second end is made in the form of two concentric circles and is installed with the possibility of acting on the brush 7.

[0027] Brush holder 3 contains one terminal electrical contact pad 17 for external connection, made on the upper surface of the brush holder, on which terminal 18 is installed for connecting the cable to the car body.

[0028] The presence of the electrical contact pad 17 ensures high-quality adhesion of the connected electrical tip of the input cable to the brush holder 3, and thereby ensures increased reliability and performance characteristics of the down-discharge device.

[0029] To protect terminal 18, a projection 19 is provided on cover 2.

[0030] The presence of protrusion 19 ensures protection of the input cable connection area and retention of the cable gland, through which insulation and protection of the internal space is carried out, brush holder 3, which ensures increased reliability and performance characteristics of the down conductor device.

[0031] Cover 2 is made of impact-resistant glass-filled polyamide and has a groove 20 for installing a cable gland 21 made of elastic electrical rubber.

[0032] The body, cover and seals are made of more durable and vandal-resistant materials, which improves the reliability and performance of the down conductor device.

[0033] The down conductor device for subway cars works as follows.

[0034] The subway cars use a current collection system in which one wire is a contact rail located to the side of the running rails, and the second wire is directly the running rails, connected to the negative terminal of the traction substation.

[0035] When a subway car is moving, electric current comes from the contact rail through the current collector shoe, passes through consumers, doing work, and then flows through the bogie frame, the down-discharge device, the axle of the wheelset and the wheel to the running rails.

[0036] Current is removed from the brush holder 3 through the contact pad 17 via the brushes 7, pressed by a clamp to the disk 14 installed on the end part of the axle of the wheelset.

[0037] In the down-discharge device, when the subway car is moving, the brushes 7, which are in contact with the contact surface of the end part of the axle of the wheel pair, wear out, but the mechanisms 8 for pressing the brushes ensure their constant contact with the disk 14, since during operation the diameter of the concentric circles increases and the roller springs 15 move the brushes 7 to the disk 14. The contact surface of the brushes relative to the contact surface of the disk 14 are located with an offset from its center of rotation, which ensures self-cleaning of the contact surfaces and an improvement in the current-carrying capacity of the unit.

[0038] When using a utility model, each distinctive essential feature of the formula of the utility model influences the achievement of the technical result, since a cause-and-effect relationship between the technical result and the set of distinctive essential features of the utility model is identified and described.

[0039] The presence of distinctive essential features of the utility model in the technical solution makes it possible to achieve the stated technical result when used: an increase in operational characteristics that ensure operational requirements for maintenance and repair.

Claims

1. A down-discharge device for subway cars, comprising a housing with a cover, inside which a brush holder is installed, in which brushes are installed with a mechanism for pressing the brushes, characterized in that on the outer surface of the housing along the perimeter of the flange there are recesses for bypassing fastening elements on the axle box of the subway car bogie.

2. A down conductor device according to paragraph 1, characterized in that at least 6 rounded recesses are made on the flange for bypassing the fastening elements on the axle box of the subway car bogie.

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