Device for conveying thick material

Abstract

Device (100) for conveying thick material, comprising: - an internal single-phase or multi-phase AC power network (1), - a number of electrical auxiliary consumers (2, 3, 10, 11) that are supplied directly from the internal single- or multi-phase AC power network (1), - an electric motor (6), and - a bidirectional power converter (4, 5, 7) which is coupled to the internal single- or multi-phase AC power network (1) and which is designed to control the electric motor (6).

Description

[0001] The invention is based on the objective of providing a device for conveying thick material with a number of auxiliary consumers, by means of which the auxiliary consumers can be operated as simply and efficiently as possible.

[0002] The device for conveying thick material, which may be, for example, a concrete pump, has an internal single- or multi-phase, in particular three-phase, alternating current network.

[0003] The device further comprises a number of electrical auxiliary loads, for example between 2 and 20, which are supplied directly from the internal single- or multi-phase AC power network, i.e., without the interposition of current-converting and / or voltage-converting components. The electrical auxiliary loads can, for example, be connected to corresponding conductors of the internal single- or multi-phase AC power network via electrical lines.

[0004] The device further comprises an electric motor, in particular a three-phase motor, and a bidirectional power converter, which is coupled to the internal single- or multi-phase AC voltage network and is designed to control the electric motor.

[0005] In one embodiment, the bidirectional power converter comprises: a DC link, a bidirectional AC / DC converter or rectifier connected between the internal single- or multi-phase AC network and the DC link, and an inverter, in particular a bidirectional inverter, which is fed from the DC link and is designed to control the electric motor.

[0006] In one embodiment, the device for conveying thick material has a connection by means of which the internal single- or multi-phase AC power network can be coupled to an external AC power network for energy exchange.

[0007] In one embodiment, the electric motor can be operated in both motor and generator modes. The device for conveying thick material includes an internal combustion engine designed to drive the electric motor in generator mode.

[0008] In one embodiment, the device for conveying thick material comprises: a first operating mode, during which the internal single- or multi-phase AC power supply is coupled to the external AC power supply, the bidirectional converter transfers electrical power from the internal AC power supply to the electric motor, and the electric motor operates as a motor; and a second operating mode, during which the internal single- or multi-phase AC power supply is decoupled from the external AC power supply, the electric motor operates as a generator, and the bidirectional converter transfers electrical power from the electric motor to the internal AC power supply. In the first operating mode, the auxiliary electrical loads are therefore supplied directly from the external AC power supply, and in the second operating mode, they are supplied from the internal AC power supply.In the second operating mode, power flows from the generator-operated electric motor via the bidirectional power converter to the internal AC power network.

[0009] In one embodiment, during the first operating mode the internal single- or multi-phase AC voltage network is coupled to the connection, and during the second operating mode the internal single- or multi-phase AC voltage network is decoupled from the connection.

[0010] In one embodiment, the electrical auxiliary consumers are selected from the set consisting of: agitators for stirring thick matter, storage charging pumps for charging pressure accumulators, high-pressure cleaners, water pumps, compressors, vibrators, cooling units, cooling pumps, fans and air conditioners, vibrating bottles, and drum drives.

[0011] In one embodiment, the device for conveying viscous material comprises at least one hydraulic pump, which is driven by the electric motor and / or by the combustion engine. The at least one hydraulic pump can, for example, drive hydraulic cylinders of the device for conveying viscous material, which serve as the drive for conveying the viscous material.

[0012] In one embodiment, the device for conveying thick material has an electrical energy storage device, which is electrically coupled, in particular, to the DC link. If the external AC network is not coupled to the internal AC network, electrical power can be transferred, for example, from the electrical energy storage device to the internal AC network via the bidirectional AC / DC converter, thereby supplying the electrical auxiliary loads from the electrical energy storage device. Fig. 1. A block diagram of a device for conveying thick material in the form of a concrete pump.

[0013] Fig. Figure 1 shows a highly schematic block diagram of a device 100 for conveying thick material in the form of a (car) concrete pump.

[0014] The device 100 for conveying thick material comprises: an internal three-phase AC power network 1, a number of electrical auxiliary consumers 2, 3, 10, 11 which are supplied directly from the internal AC power network 1, an electric motor 6, and a bidirectional power converter formed from the components 4, 5 and 7, which is coupled to the internal AC power network 1 and which is designed to control the electric motor 6.

[0015] The bidirectional power converter has the following components: a DC link 4, a bidirectional AC / DC converter 5, which is connected between the internal AC network 1 and the DC link 4, and a bidirectional inverter 7, which is fed from the DC link 4 and is designed to control the electric motor 6.

[0016] The device 100 for conveying thick material has a connection 8 by means of which the internal AC voltage network 1 can be coupled to an external AC voltage network 200, via which electrical power can be transferred towards the internal AC voltage network 1.

[0017] The electric motor 6 can be operated as a motor and as a generator, wherein the device 100 for conveying thick material has an internal combustion engine 9 which is designed to drive the electric motor 6 in its generator operation.

[0018] The device 100 for conveying thick material has a first operating mode in which the internal AC power network 1 is coupled to the external AC power network 200, electrical power is transferred from the external AC power network 200 towards the internal AC power network 1, electrical power is transferred from the internal AC power network 1 towards the electric motor 6 and the electric motor 6 operates as a motor.

[0019] The device 100 for conveying thick material has a second operating mode, during which the internal AC voltage network 1 is decoupled from the external AC voltage network 200, the electric motor 6, for example driven by the combustion engine 9, operates as a generator and electrical power is transferred from the electric motor 6 towards the internal AC voltage network 1.

[0020] During the first operating mode, the internal AC network 1 is coupled to terminal 8, and during the second operating mode, the internal AC network 1 is decoupled from terminal 8.

[0021] Examples of electrical auxiliary consumers include: agitators, storage charging pumps, water pumps 2, high-pressure cleaners 3, compressors 10, vibrators 11, cooling units, cooling pumps, fans and air conditioners, vibrating bottles, drum drives, etc.

[0022] The device 100 for conveying thick material has at least one hydraulic pump 12, which is driven by the electric motor 6 and / or by the combustion engine 9 and supplies the associated hydraulic drives.

[0023] The device 100 for conveying thick material has an electrical energy storage device 13 electrically coupled to the DC intermediate circuit 4.

Claims

[1] Device (100) for conveying thick material, comprising: - an internal single-phase or multi-phase AC power network (1), - a number of electrical auxiliary consumers (2, 3, 10, 11) that are supplied directly from the internal single- or multi-phase AC power network (1), - an electric motor (6), and - a bidirectional power converter (4, 5, 7) which is coupled to the internal single- or multi-phase AC power network (1) and which is designed to control the electric motor (6). [2] Device (100) for conveying thick material according to claim 1, characterized by , that - the bidirectional power converter (4, 5, 7) has: - a DC intermediate circuit (4), - a bidirectional AC / DC converter (5) connected between the internal single- or multi-phase AC voltage network (1) and the DC voltage intermediate circuit (4), and - an inverter (7), in particular a bidirectional inverter, which is supplied from the DC intermediate circuit (4) and which is designed to control the electric motor (6). [3] Device (100) for conveying thick material according to one of the preceding claims, characterized by , that - the device (100) for conveying thick material has a connection (8) by means of which the internal single- or multi-phase AC voltage network (1) can be coupled to an external AC voltage network (200). [4] Device (100) for conveying thick material according to one of the preceding claims, characterized by , that - the electric motor (6) can be operated as a motor and as a generator, and - the device (100) for conveying thick material has an internal combustion engine (9) which is designed to drive the electric motor (6) in generator mode. [5] Device (100) for conveying thick material according to claim 4, characterized by , that - the device (100) for conveying thick material comprises: - a first operating mode, during which the internal single- or multi-phase AC voltage network (1) is coupled to the external AC voltage network (200), the bidirectional power converter (4, 5, 7) transfers electrical power from the internal AC voltage network (1) towards the electric motor (6) and the electric motor (6) operates as a motor, and - a second operating mode in which the internal single- or multi-phase AC network (1) is decoupled from the external AC network (200), the electric motor (6) operates as a generator and the bidirectional converter (4, 5, 7) transfers electrical power from the electric motor (6) towards the internal AC network (1). [6] Device (100) for conveying thick material according to claim 5, characterized by , that - during the first operating mode, the internal single- or multi-phase AC voltage network (1) is coupled to the terminal (8), and - during the second operating mode, the internal single- or multi-phase AC voltage network (1) is decoupled from the connection (8). [7] Device (100) for conveying thick material according to one of the preceding claims, characterized by , that - the electrical auxiliary consumers are selected from the set consisting of: - agitators (), - Storage charging pumps (), - High pressure washers (3), - Water pumps (2), - Compressors (10), - Vibrators (11), - Cooling units, cooling pumps, fans and air conditioners, - Shaker bottles, and - Drum drives. [8] Device (100) for conveying thick material according to one of the preceding claims, characterized by , that - the device (100) for conveying thick material has at least one hydraulic pump (12) which is driven by the electric motor (6) and / or by the internal combustion engine (9). [9] Device (100) for conveying thick material according to any one of claims 2 to 8, characterized by , that - the device (100) for conveying thick material has an electrical energy storage device (13) which is electrically coupled, in particular to the DC intermediate circuit (4).

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