DE3124045C2 - Converter housing for underground mining - Google Patents

Abstract

The housing for a switchgear for controlling electrical loads (19) underground consists of a first vacuum-tight sub-housing (1) of protection type "s", in which a boiling-down converter (5) and a heat exchanger (6) are housed, and a second sub-housing (2) Type of protection "d", in which the control and regulation (10) for the converter (5) is located, as well as connection boxes (3) of type of protection "e" for external cable inputs and outputs (12).

Description

- A first vacuum-tight, pressure-resistant sub-housing (1) of ignition protection type "s", in which a converter (5) made up of at least partially controllable power semiconductors is installed, the converter (5) with a liquid boiling coolant! (S) is covered and in the upper part of the housing part (1) there is a heat exchanger (6) that cools the evaporative cooling fluid (9),

- as well as a second sub-housing (2) adjacent to this first sub-housing (1) of the ignition protection! "D", in which the equipment for switching on (18) and the control and regulation (10) of the converter (5) and the load switch (20) for the mains connection (11) of the converter (5) are installed.

2. Housing according to claim 1, characterized in that the heat exchanger (6) to an external Cooling water circuit (7) is connected.

3. Housing according to one of claims 1 or 2, characterized in that the second housing part (2) is provided with a door (13) which is safety-interlocked with the load switch (20) that can be operated from outside is

4. Housing according to one of claims 1 to 3, characterized in that the connection boxes (3) Doors or unscrewable covers (14) in which cable glands (15) and / or coupling links (4) are mounted.

5. Housing according to one of claims 1 to 4, characterized in that the housing has over the housing part (I ₁ 2) distributed lifting eyes (16) and / or skids (17).

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The invention relates to a housing according to the preamble of claim 1. Such a housing is known from DE-OS 31 18 446.

It is obvious in such prior art to Control of electrical consumers, especially motors, a converter with controllable semiconductors to use. This then makes it possible to cope with the hard switching operation of three-phase motors with fixed Replace voltage and frequency values with a regulated converter drive. This will be Machines and materials are spared, so wear and tear is reduced. Thus, the service life is increased, and Ultimately, downtimes are reduced.

However, problems arise in the case of systems that are to be used in underground mining. On the one hand, the power components of the converter must be well cooled despite the limited space available and, on the other hand, the requirements for firedamp-proof electrical equipment are in accordance with the regulations DIN EN 50 014 (general provisions), DIN EN 50 018 (flameproof enclosure of ignition protection type "d") and DIN Observe EN 50 019 (increased safety of ignition protection type »e«) za .

The invention is therefore based on the object of specifying a housing of the type mentioned above, A regulated converter drive in underground mining with a suitable one with the most compact design possible Cooling enabled in compliance with DIN regulations for firedamp protection

This object is achieved according to the invention by the features characterized in claim 1

Advantageously, the individual components are arranged with due consideration of the firedamp protection nevertheless, the use of evaporative cooling allows a very compact design because of the intensive Cooling of the power rectifier power supply too. Additionally there is the advantage that the sub-housings and connection boxes are produced independently of one another and, if necessary, can be individually subjected to the ignition test.

Advantageous embodiments of the invention are characterized in the subclaims

The invention is described below with reference to the drawing are explained for an embodiment. It shows

F i g. 1 a schematic diagram and

F i g. 2a, b, c the structural design of a housing according to the invention in side view, top view and front view

According to FIG. 1 in a vacuum-tight, flameproof housing 1 of ignition protection type "s", a power converter partially made up of controllable power semiconductor switches (thyristors) is installed along with wiring electrical consumers, a three-phase motor 19, connected.

The heat loss from the converter 5 is dissipated by evaporative cooling. For this purpose, the partial housing 1 is filled with a liquid coolant to such an extent that all electrical components are covered by it. In the upper part of the partial housing there is a heat exchanger 6 through which the cooling water of an external cooling water circuit 7 flows during operation. At temperatures around z. B. 50 ⁰ C evaporates the boiling liquid. The rising steam contains a considerable amount of heat which reaches the heat exchanger 6 and is carried away with the cooling water flowing through it. The steam cools down and participates again in the boiling process as condensate dripping back.

A subhousing 2 of ignition protection type "d" adjacent to the first subhousing 1 essentially contains operating equipment for the switch-on 18 as well as the control and regulation 10 of the converter 5 and the load switch 20 Capacitor circuit 22 for the converter 5 and measuring devices 23 for load current, voltage and frequency are provided.

Access to the partial housing 2 is, as FIG. 2a, 2b and 2c show, ensured by a door 13, which is safety-locked with the load switch 20 that can be operated from the outside via a door lock 8.

On the front of the two partial housings 1 and 2 are

the connection boxes 3 of protection type "e" for external cable inlets and outlets 12. Access is achieved through doors or screw-on covers 14 in which cable glands 15 and, if necessary, coupling links 4 (between protection types "e" and "i « Z. B. according to DE-OS 29 17 864) can be mounted.

To transport the housing or the partial housings 1, 2 there are carrying lugs distributed over the partial housings 16 and skids 17 are provided. The cover 25 screwed onto the partial housing 1 is used during assembly transported via eyelets 24.

For this purpose 2 sheets of drawings

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Claims (1)

Patent claims: 1. Housing for a switchgear for controlling electrical consumers in underground mining, which is made up of housing parts of different types of protection, with a sub-housing of protection type "d" accommodating switching and / or monitoring devices and connection boxes of protection type "e" for at least one sub-housing external cable inlets and outlets are attached to the sub-housings, characterized by