A high voltage box for tram

Abstract

The present invention discloses a high-voltage box for a tram, including a box cover, a box body and electrical equipment; the box cover and the box body are fixed with a compression lock and a sealing structure is provided; a one-way valve is installed at the bottom of the box body for discharging accumulated water and maintaining the air pressure balance inside and outside the box body; the electrical equipment is installed in the box body, wherein the terminal and the isolating switch are arranged on the crossbeam raised at the bottom of the box body, the freewheeling resistor, the contactor and the terminal row are arranged near or located at the inner side of the box body, and the connector is arranged on the outside of the box body for leading the control line of the high-voltage box outward; the box body is also provided with a waterproof connector to lead the cables of the electrical equipment to the corresponding functional positions. The present invention provides a high-voltage box with a compact structure designed in a limited space, which realizes the reliability and maintainability of the installation of the internal equipment of the high-voltage box, meets the convenience of wiring and wiring, ensures that the electrical components have better protection and better function realization, and improves the safety of the train.

Description

Technical Field

[0001] The invention belongs to the technical field of urban rail transit vehicles, and in particular relates to a high-voltage box of a tram. Background Art

[0002] With the acceleration of urbanization, the population is highly concentrated in large and medium-sized cities, and the demand for rail transportation has increased, which has promoted the rapid development of trams and also put forward higher requirements for the safety of trams. For rail vehicles, the high-voltage box is mainly used as a switch for the train power supply. Its main function is to switch and connect the power supply of the pantograph, the workshop power supply, and the grounding of the train. It plays an important role in ensuring the safety of the train. The high-voltage box is responsible for the distribution, transmission, conversion and protection of the train's electric energy.

[0003] Since the space under the 100% low-floor modern tram is limited, most of the equipment such as the high-voltage box is installed on the roof, resulting in a tight space for arranging the equipment on the roof. Therefore, it is necessary to improve the design method of the high-voltage box in the prior art. Summary of the invention

[0004] The purpose of the present invention is to provide a high-voltage box for a tram in view of the above-mentioned problems, optimize the structural distribution of the high-voltage box, improve the reliability and maintainability of the high-voltage box, and facilitate the realization of the functions of the high-voltage box.

[0005] The technical contents of the present invention are as follows:

[0006] A high-voltage box for a tram, comprising a box cover, a box body and electrical equipment; the box cover and the box body are fixed with a compression lock and are provided with a sealing structure; a one-way valve is installed at the bottom of the box body for discharging accumulated water and maintaining the air pressure balance inside and outside the box body; the electrical equipment is equipment required for the high-voltage box to implement its functions, including connectors, terminals, isolating switches, freewheeling resistors, contactors and terminal blocks, the terminals and isolating switches are arranged on a crossbeam raised at the bottom of the box body, the freewheeling resistors, contactors and terminal blocks are arranged near or on the inner side of the box body, and the connector is arranged outside the box body for leading the control line of the high-voltage box to the outside; a waterproof connector is also provided on the box body to lead the cables of the electrical equipment to the corresponding functional positions.

[0007] In a specific embodiment of the present invention, the box body and the box cover are sealed by a labyrinth seal with a sealing strip.

[0008] In a specific embodiment of the present invention, the terminal can extend from the waterproof connector. Further, the opening of the box body for installing the waterproof connector corresponds to the connector of the isolating switch.

[0009] In a specific embodiment of the present invention, the inner part of the box body is divided into a high-pressure area and a low-pressure area.

[0010] In a specific embodiment of the present invention, a grounding device is provided on the box cover or the box body.

[0011] In a specific embodiment of the present invention, handrails are provided at both ends of the box cover.

[0012] Due to the adoption of the above technical scheme, the advantages of the present invention are: the present invention provides a high-voltage box with a compact structure designed in a limited space; realizes the reliability and maintainability of internal equipment installation, and meets the convenience of wiring and wiring; can meet the IP65 protection level; meets the internal high and low voltage partitioning; adopts the high-voltage box of the present invention to ensure that the electrical components have better protection and better function realization, avoid the influence of the external environment on the circuit, and improve the safety of the train. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The three-dimensional structure of the high-voltage box of the present invention is schematically shown;

[0014] Figure 2 A schematic diagram of the high-voltage box of the present invention from another perspective;

[0015] Figure 3 A top view of a hidden box cover of a high-voltage box of the present invention;

[0016] Figure 4 It is a front view of the hidden box cover of the high-voltage box of the present invention;

[0017] Figure 5 It is a structural schematic diagram of the box cover of the high-voltage box of the present invention;

[0018] Figure 6 It is a schematic diagram of the sealing structure of the box cover and the box body of the high-voltage box of the present invention;

[0019] Figure 7 It is a wiring diagram of the high-voltage box of the present invention;

[0020] Markings in the figure: 1-box cover, 2-box cover handrail, 3-pressed lock, 4-box body, 5-waterproof connector, 6-connector, 7-terminal, 8-isolating switch, 9-following resistor, 10-contactor, 11-terminal block, 12-box crossbeam, 13-sealing strip, 14-door panel reinforcement rib, 15-check valve, 16-grounding block. DETAILED DESCRIPTION

[0021] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0022] Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0023] Example

[0024] like Figure 1 to Figure 5 As shown, a high-voltage box for a tram includes a box cover 1, a box body 4 and electrical equipment; the electrical equipment is equipment required for the high-voltage box to implement its functions, including a connector 6, a terminal 7, an isolating switch 8, a freewheeling resistor 9, a contactor 10 and a terminal block 11. The box cover 1 is fixed to the box body 4 by a compression lock, and a sealing structure is provided. The back of the box cover is preferably provided with a door panel reinforcement rib 14; Figure 1 As shown, four compression locks 3 are installed at the four corners of the box cover 1 to fix the box cover 1 to the box body 4. A one-way valve 15 is installed at the bottom of the box body to drain the accumulated water and maintain the air pressure balance inside and outside the box body; the terminal 7 and the isolating switch 8 are arranged on the raised crossbeam at the bottom of the box body 4, and the freewheeling resistor 9, the contactor 10 and the terminal row 11 are arranged near or on the inner side of the box body to prevent the device from short-circuiting after the water accumulates in the box body, which affects the safety of the vehicle system. The connector 6 is arranged outside the box body 4 to lead the control line of the high-voltage box to the inside of the vehicle; the box body 4 is also provided with a waterproof connector 5 to lead the cables of the electrical equipment to the corresponding functional positions.

[0025] In a specific embodiment, the box body and the box cover are sealed by a labyrinth seal with a sealing strip 13, such as Figure 6 As shown. Since the high-voltage box belongs to the high-voltage system of the train, and the box is located on the roof of the train, the environment is relatively harsh, so the sealing of the box is of great significance to the safety of the train. The sealing method of the present invention has IP65 protection performance. At the same time, the selected connector and waterproof joint also preferably have IP65 waterproof performance, thereby improving the waterproof performance of the entire high-voltage box.

[0026] In a specific embodiment, the terminal can extend from the waterproof connector so that when the box is removed or maintained, the cable terminal does not need to be cut and then crimped again. Furthermore, the opening of the box for installing the waterproof connector corresponds to the connector of the disconnector. The cable can be connected to the disconnector connector without bending, thereby reducing the bending radius of the cable, which is convenient for wiring installation and later maintenance.

[0027] In a specific embodiment, the inner part of the box is divided into a high-voltage area and a low-voltage area. The isolating switch and terminals arranged on the raised beam at the bottom of the box are the high-voltage area, and the area where the freewheeling resistor, contactor and terminal block are located is the low-voltage area. The high and low voltages are separated to ensure safety and avoid electromagnetic interference.

[0028] In a specific embodiment, a grounding device is provided on the box cover or the box body. Figure 4 As shown, a power connection block 16 is provided on the box cover 1 to ensure the safety of personnel during maintenance and overhaul.

[0029] In a specific embodiment, handrails 2 are provided at both ends of the box cover to facilitate operation.

[0030] The working process of the high-voltage box of the present invention is as follows: the high-voltage box is mainly divided into three positions, namely the pantograph position, the grounding position, and the workshop power supply position. Figure 7 shown.

[0031] like Figure 7 As shown: the high-voltage box has three working conditions. When it is in the pantograph position: the P2 port of the high-voltage box is connected to the high-speed circuit breaker, and the electricity introduced from the pantograph is connected to the traction inverter P1 and air conditioner D1 and other equipment in the car; when it is in the workshop power supply position, the train receives electric energy in the maintenance depot or other places, and the electric energy passes through the depot socket installed on the lower side of the car, and then through the P3 interface of the high-voltage box and the electrical equipment in the high-voltage box, and is supplied to the traction inverter P1 and air conditioner D1 and other equipment; when the train is in the grounding position, the electrical equipment of the whole car will be connected to the grounding resistor through the grounding port PE of the high-voltage line to ensure the grounding of the whole car and the normal inspection and maintenance of the train.

[0032] The specific wiring method of the high-voltage box is as follows: the grounding position PE of the isolating switch in the high-voltage box is connected to the high-voltage box interface A, the storage socket position P3 of the isolating switch is connected to the high-voltage box interface D, and the pantograph position P2 of the isolating switch is connected to the high-voltage box interfaces B and C. The low-voltage wiring is the control wiring of the isolating switch of the high-voltage box 17, thereby realizing the control of the isolating switch and the function of the high-voltage box to monitor the switch position status in real time.

[0033] In order to ensure the instantaneous high voltage when the train starts, a freewheeling resistor is added to the high-voltage box to improve the safety of train starting and working condition conversion.

[0034] When the electrical equipment inside the high-voltage box of the present invention needs to be repaired, the power supply of the vehicle is disconnected, the high-voltage box is ensured to be in a grounded position, the high-voltage box is put in a non-powered state, and then the compression lock is opened, and then the box cover 1 is opened, and then the electrical equipment in the high-voltage box is inspected and replaced.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-voltage box for a tram, characterized in that: It includes a box cover, a box body and electrical equipment; the box cover and the box body are fixed with a compression lock and a sealing structure is provided; a one-way valve is installed at the bottom of the box body to discharge accumulated water and maintain the air pressure balance inside and outside the box body; the electrical equipment is the equipment required for the high-voltage box to implement its functions, including connectors, terminals, isolating switches, freewheeling resistors, contactors and terminal blocks, the terminals and isolating switches are arranged on the raised crossbeams at the bottom of the box body, the freewheeling resistors, contactors and terminal blocks are arranged near or on the inner side of the box body, and the connector is arranged outside the box body to lead the control line of the high-voltage box to the outside; the box body is also provided with a waterproof connector to lead the cables of the electrical equipment to the corresponding functional positions; The box body and the box cover are sealed by a labyrinth seal with a sealing strip; The terminal can extend from the waterproof connector; The opening of the box body for installing the waterproof joint corresponds to the joint of the isolating switch; The inner part of the box is divided into a high-pressure area and a low-pressure area; A grounding device is arranged on the box cover or the box body; Handrails are arranged at both ends of the box cover.

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