ROAD MAKING MACHINE WITH HEAT PUMP

Abstract

The disclosure relates to a road making machine in the form of a road finishing machine for producing a paving layer, or of a charger vehicle for conveying laying material to a road finishing machine. The road making machine includes a tractor, a primary drive source, a chassis, a material bunker, and a heating system, wherein the heating system includes a heat pump.

Claims

1. A road making machine formed as a road finishing machine for producing a paving layer, or formed as a charger vehicle for conveying laying material to a road finishing machine, wherein the road making machine comprises a tractor, a primary drive source, a chassis, a material bunker and a heating system, wherein the heating system includes a heat pump.

2. The road making machine according to claim 1, wherein the road making machine is a road finishing machine, and the heating system is configured to heat a screed of the road finished machine.

3. The road making machine according to claim 1, wherein the road making machine is configured to power the primary drive source from an energy storage of the road making machine, and the heating system is configured to cool down the energy storage.

4. The road making machine according to claim 1, wherein the heat pump comprises an evaporator, a liquefier, a compressor, and/or an expansion valve.

5. The road making machine according to claim 1, wherein the heating system is configured to heat at least one first component of the road making machine and to cool down at least one second component of the road making machine.

6. The road making machine according to claim 1, wherein the heating system includes a first working medium circulatable in a first circuit of the heating system, and/or a second working medium circulatable in a second circuit of the heating system, and/or a third working medium circulatable in a third circuit of the heating system.

7. The road making machine according to claim 6, wherein the heat pump is configured to increase a first temperature of the second working medium to a second temperature.

8. The road making machine according to claim 6, wherein a temperature of the third working medium in the third circuit is between 75? C. and 200? C.

9. The road making machine according to claim 8, wherein the temperature of the third working medium in the third circuit is between 100? C. and 150? C.

10. The road making machine according to claim 6, wherein the heating system is configured to supply the first working medium into the first circuit by means of an airflow machine.

11. The road making machine according to claim 6, wherein the first working medium is in heat-exchanging contact at least with one cooler of an energy storage of the road making machine.

12. The road making machine according to claim 6, wherein the heating system is configured to heat a first component of the road making machine, and the third working medium is in heat-exchanging contact with the first component.

13. The road making machine according to claim 6, wherein the first working medium and/or the second working medium and/or the third working medium contains an antifreeze.

14. The road making machine according to claim 1, wherein the heat pump is arranged at the tractor.

15. The road making machine according to claim 1, wherein the heating system is configured to heat a first component of the road making machine, and the heat pump is arranged at the first component.

16. A method for operating a heating system of a road making machine formed as a road finishing machine for producing a paving layer, or formed as a charger vehicle for conveying laying material to a road finishing machine, wherein the road making machine includes a tractor, a primary drive source, a chassis, a material bunker and a heating system, and wherein the heating system includes a heat pump, the method comprising: circulating a first working medium in a first circuit; transferring heat from the first working medium to a second working medium circulating in a second circuit; increasing a first temperature of the second working medium to a second temperature by compressing the second working medium; transferring heat from the second working medium to a third working medium circulating in a third circuit; and transferring heat from the third working medium to a first component of the road making machine.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Embodiments according to the disclosure are shown in the following figures. In the drawings:

[0025] FIG. 1 shows a schematic perspective view of a road making machine in the form of a road finishing machine;

[0026] FIG. 2 shows a schematic perspective view of a road making machine in the form of a charger vehicle;

[0027] FIG. 3 shows a schematic representation of an embodiment of the heating system according to the disclosure;

[0028] FIG. 4 shows a schematic representation of a further embodiment of the heating system according to the disclosure;

[0029] FIG. 5 shows a schematic representation of a further embodiment of the heating system according to the disclosure;

[0030] FIG. 6 shows a schematic representation of a further embodiment of the heating system according to the disclosure; and

[0031] FIG. 7 shows a schematic representation of a further embodiment of the heating system according to the disclosure.

DETAILED DESCRIPTION

[0032] FIG. 1 shows a road making machine 1 in a perspective view from obliquely behind, which is a road finishing machine 2 for producing a paving layer ES. The road finishing machine 2 is self-propelled. The road finishing machine 2 has a tractor M, a primary drive source 3, a chassis 4, a material bunker 5 for receiving a laying material B (mixed asphalt material), a control platform 6, a driver roof 7, a screed 8 mounted at the chassis 4 to be height-adjustable and being towed in the direction of travel R, and a conveying unit 9 to provide the laying material B from a material bunker 5 of the road finishing machine 2 to or toward the screed 8, e.g., to a transverse distribution device 10 of the road finishing machine 2 positioned in front of the screed 8. The road finishing machine 2 comprises a heating system 11 according to the disclosure. The heating system 11 is at least configured to heat a first component 12 of the road finishing machine 2, e.g., the screed 8.

[0033] FIG. 2 shows a road making machine 1 in a perspective view from obliquely behind which is a charger vehicle 13 for conveying laying material B to a road finishing machine 2 driving behind it. The charger vehicle 13 is self-propelled and comprises a tractor M, a primary drive source 3, a chassis 4, a material bunker 5 for receiving the laying material B, a control platform 6, a driver roof 7, a conveying unit 9 for transporting the laying material B from the material bunker 5 of the charger vehicle 13 into the material bunker 5 of the road finishing machine 2. The charger vehicle 13 comprises a heating system 11 according to the disclosure. The heating system 11 is at least configured to heat a first component 12 of the charger vehicle 13, e.g., the material bunker 5.

[0034] FIG. 3 shows an embodiment of the heating system 11, 11 according to the disclosure. The heating system 11, 11 discloses a heat pump 14, 14, comprising an evaporator 15, 15, a liquefier 16, 16, a compressor 17, 17, an expansion valve 18, 18, and an electric motor 19, 19 which are arranged in a housing 20, 20 of the heat pump 14, 14. The housing 20, 20 is arranged at the tractor M, M. In a first circuit 21, 21 of the heating system 11, 11, a first working medium 22, 22 or air, respectively, is circulated. The ambient air is supplied into a first air conduction conduit 24, 24 of a tube 25, 25 of the first circuit 21 by means of an airflow machine 23, 23 (e.g., fan), and discharged from a second air conduction conduit 26, 26. The first working medium 22, 22 is circulated in the tube 25, 25 of the first circuit 21, for example by means of a pump (not shown). A portion of the tube 25, 25 is wound around the evaporator 15, 15 for heat exchange.

[0035] The heat of the ambient air evaporates a second working medium 28, 28 circulating in a second circuit 27, 27 of the heating system 11, 11 in the evaporator 15, 15. The second working medium 28, 28 is supplied to the compressor 17, 17 in a gaseous state and compressed by means of the compressor 17, 17 and thereby heated. Here, a first temperature T1, T1 of the second working medium 28, 28 is increased to a second temperature T2, T2. In the liquefier 16, 16, the second working medium 28, 28 is condensed, so that the heat of the second working medium 28, 28 is dissipated to the environment. The second working medium 28, 28 is further supplied to the expansion valve 18, 18 in a liquid state. By means of the expansion valve 18, 18, a pressure level of the second working medium 28, 28 is reduced, and the second working medium 28, 28 is further cooled down.

[0036] The electric motor 19, 19 is electrically powered by a current inverter W, W of an energy storage 29, 29 (e.g., battery) of the road finishing machine 2.

[0037] In a third circuit 30, 30 of the heating system 11, 11, a third working medium 31, 31 or a liquid, respectively, comprising, for example, water and antifreeze, is circulated in a tubing 32, 32, for example by means of a pump (not shown). A portion of the tubing 32, 32 is wound around the liquefier 16, 16. One portion of the tubing 32, 32 is located outside the housing 20, 20, and one portion of the tubing 32, 32 is fastened to the housing 20, 20. The second working medium 28, 28 in the liquefier 16, 16 transfers its heat partially to the third working medium 31, 31 and thereby cools down. The heated third working medium 31, 31 is supplied to a heat exchanger 33, 33. The third working medium 31, 31 is caused to flow through the heat exchanger 33, 33, and the component 12, 12 is heated. The heat exchanger 33 can be arranged at the first component 12 of the road finishing machine 2, for example at a screed plate 34 of the screed 8. The heat exchanger 33 can be arranged at the first component 12 of the charger vehicle 13, for example at the material bunker 5. Subsequently, the third working medium 31, 31 is discharged to the liquefier 16, 16 and heated again there. A temperature T of the third working medium circulating in the third circuit can reach up to 125? C.

[0038] FIG. 4 shows a further embodiment of the heating system 11, 11 according to the disclosure. This embodiment differs from the embodiment represented in FIG. 3 by the heating system 11, 11 cooling down a second component 35, 35 of the road making machine 1 during the heating of the first component 12, 12. Here, the waste heat of the second component 35, 35 is used as a heat source 36, 36 for the heating system 11, 11. The second component 35, 35 can be an energy storage 29, 29 (e.g., battery). The first working medium 22, 22 circulating in the first circuit 21, 21 is cooled down by the heat-exchanging contact with the evaporator 15, 15 in the heat pump 14, 14 and supplied to a cooler 37, 37 of the energy storage 29, 29. The first working medium 22, 22 in its cooled-down state will cool down the energy storage 29, 29 and is heated thereby. The first working medium 22, 22 is supplied to the heat pump 14, 14 in its heated state and will transfer its heat to the second working medium 28, 28 by the heat-exchanging contact with the evaporator 15, 15. As described above, the third working medium 31, 31 is heated by the heat pump 14, 14 and dissipates its heat in turn to the first component 12, 12 by means of the heat exchanger 33, 33.

[0039] FIG. 5 shows a further embodiment of the heating system 11, 11 according to the disclosure. This embodiment differs from the embodiment represented in FIG. 4 by the first circuit 21, 21 being connected to the cooler 37, 37 of the energy storage 29, 29 to use the waste heat of the energy storage 29, 29 for evaporating the second working medium 28, 28. The airflow machine 23, 23 is connected to the first circuit 21, 21 to supply the ambient air into a third air conduction conduit 38, 38 of the first circuit 21, 21 and dissipate it again to the environment from a fourth air conduction conduit 39, 39.

[0040] FIG. 6 shows a further embodiment of the heating system 11 for the road finishing machine 2 according to the disclosure. This embodiment differs from the embodiment represented in FIG. 4 by the heat pump 14 being arranged at the screed 8 of the road finishing machine 2.

[0041] FIG. 7 shows a further embodiment of the heating system 11 for the road finishing machine 2 according to the disclosure. This embodiment differs from the embodiment represented in FIG. 3 by the heat pump 14 being arranged at the screed 8 of the road finishing machine 2.