RU2690548C1 - System for construction machine hydraulic tank heating - Google Patents

Abstract

FIELD: machine building.SUBSTANCE: system is intended for hydraulic drive of construction machines, which are operated in conditions of negative temperatures and far from stationary bases. System comprises a body with a cover on top of which there is a drain line and a pressure line in the cover, the body have walls. ICE and body are connected by exhaust path. In the body the exhaust path is tightly connected to the heat exchanger. ICE and body are connected by tubes. In place of tight inlet of tube into body tube is tightly connected to heat exchanger. Cooling fluid moves from ICE to heat exchanger via one tube, while cooling fluid flows from heat exchanger to ICE via second tube. ICE is connected by cables to coils arranged around drain and pressure lines, respectively.EFFECT: higher efficiency of hydraulic tank heating.1 cl, 2 dwg

Description

The invention relates to the field of engineering, in particular to the hydraulic drive of construction machines, which are operated in conditions of negative temperatures and away from stationary bases.

The known system of heating the hydraulic drive [RF Patent for invention №2559227, IPC F02N 19/04 (2010.01), published 08/10/2015] contains a small hydraulic tank, which is equipped with a heat exchanger (small hydraulic tank has a double bottom, the heat exchanger is a cavity between the upper and lower bottom small hydraulic tank), in the heat exchanger there are openings for the entrance and exit of exhaust gases, which are connected to the exhaust system of the road construction machine (SDM). The volume of the small hydraulic tank is 10-20% of the standard hydraulic tank, the small hydraulic tank and the standard hydraulic tank are interconnected by two hydrolines. The first hydroline has a control valve and a pump (for example, a lamellar or helical design) for pumping cold, viscous working fluid from a standard hydraulic tank to a small hydraulic tank. The second line has a check valve and a pump to prevent overheating of the working fluid in the small hydraulic tank. The small hydraulic tank and the standard hydraulic tank are connected by hydrolines to the pump through the valve. The pump is connected to a hydraulic motor (for example, a hydraulic cylinder) through a hydraulic distributor. The heat exchanger is connected to an internal combustion engine (ICE) through an exhaust system with a flap.

The disadvantage of the system is that there is no possibility of warming up the hydraulic drive system before starting the main internal combustion engine.

A device is known for warming up the hydraulic tank and the SDM engine [RF Patent for invention no. 2560767, IPC F02N 19/04 (2010.01), published 08/05/2014], which has a housing, in the lower part (bottom) of which there are two or more channels. In the channels there are transporting rods, one end of which is made with a place for a tablet intended for igniting a fire, and the other end contains a handle for moving the rod through the channel. From above, the housing is equipped with a full-detachable lid with perforated heights with grooves for fastening the guide tubes. Guide tubes can be of different shapes and have the ability to be mounted on each other (due to different diameters, in the upper and lower parts of the guide tube), for the implementation of a more local, directional heating. On the front of the case, on a level with handles for transporting the rods, there is a conveying arc. The device can be installed on the means 9 for transportation, such as skis.

The disadvantages of the device is that to control the operation mode of the device, attracted staff.

A known system of thermal preparation of the elements of the hydraulic drive [RF Patent for invention №2569862, IPC F15B 21/00 (2006.01), published on November 27, 2015], which has an internal combustion engine, to the cooling system of which pipelines are connected, a thermostat connected to a radiator. The pipeline is connected to a thermostat. A pump is connected through a pipeline, which is connected to a two-way distributor. From the on-off distributor pipelines are connected to the jacket of the hydraulic engine. The thermostat has two positions (cooling the internal combustion engine through a radiator or heating the hydraulic motor jacket). The jacket body can be removable or non-removable, designed for a working pressure in the system, from materials providing high thermal conductivity and structural strength with maximum temperature differences.

The disadvantages of the device is the low efficiency of the system and a large investment of time for the process of heating the hydraulic tank.

The objective of the proposed invention is the creation of a device for heating the hydraulic tank with the functions of reducing the time spent on heating the hydraulic tank of construction machines operating in field conditions at negative temperatures by equipping the hydraulic drive with a system of heating the hydraulic tank of the construction machine.

The technical result of the proposed system of heating the hydraulic tank is to increase the efficiency of heating through the use of heat: coolant (coolant) from the internal combustion engine, by introducing into the system tubular heat exchangers of the exhaust gases of the internal combustion engine, and using electric heating elements (PET) Vklechennyh into the network from the engine generator.

This technical result is achieved by the fact that the heating system of the construction machine hydraulic tank contains an internal combustion engine (ICE), in the cooling system of which there are tubes that are connected to a heat exchanger, in the exhaust system there is an exhaust path with a heat exchanger, and a cable for transmitting electric current to the coils ). Heat exchangers connected to the cooling system and to the exhaust system are located in the lower part of the hydraulic tank housing.

The claimed technical solution is illustrated by the scheme, where figure 1 shows the heating system of the hydraulic tank, thin arrows show the direction of the coolant movement (with the help of coolant, heat is transferred from the internal combustion engine to the internal cavity of the hydraulic tank housing). The wide white arrows indicate the direction of the exhaust gases along the exhaust path from the engine to the hydraulic tank housing. The wires carry current from the internal combustion engine to the coils (heating elements). The figure 2, shows the location of the heat exchangers and their shape (from the housing cover shows: pressure and drain line with coils).

The warm-up system of the construction machine hydraulic tank comprises a housing 1, on top of which there is a cover 2, in the cover 2 there is a drain line 3 and a pressure line 4, in case 1 there are walls 5 to reduce fluid oscillations in the hydraulic tank. The warm-up system of the construction machine hydraulic tank has an additional internal combustion engine 6 (for example, PD-10M). ICE 6 is a well-known engine designed for starting and operating in cold conditions, the volume of ICE 6 is less than the volume of the main engine of the engine. The internal combustion engine 6 and the housing 1 are connected by an exhaust path 7, with high-temperature thermal insulation insulated on it on the outer surface. In the housing 1, the exhaust path 7 is hermetically connected to the heat exchanger 8. The internal combustion engine 6 and the housing 1 are connected by tubes 9 and 11 (having thermal insulation). In the place of the tight entry of the tube 9 into the housing 1, the tube 9 is tightly connected to the heat exchanger 10. The tube 9 The coolant moves from the internal combustion engine 6 to the heat exchanger 10. The heat exchanger 8 and 10 have the form of a coil without thermal insulation for efficient heat exchange with the working fluid in the housing 1 The exhaust path 7 and the tube 9 is connected to the housing 1 so that the heat exchangers 8, 10 give the total greatest amount of heat near the pressure line 4. The ICE 6 is connected by cables 12 to the coils 15 and 16 placed around the drain 3 and pressure 4 lines respectively enno.

The device works as follows. Before starting the main internal combustion engine of the machine, check for the presence of working fluid inside the housing 1 and start the internal combustion engine 6. From the internal combustion engine 6, exhaust gases flow through the exhaust path 7 to the heat exchanger 8 (shown in figure 1 with white wide arrows). At the same time, an electric current is generated from the electric generator (not shown in the figure) of the internal combustion engine 6, which is transmitted via wires 12 to the coil 16 (TEN) of the pressure line 4 and to the coil 15 of the drain line 3. The cooling system of the internal combustion engine 6 consisting of a tube 9 provides the flow of coolant into the heat exchanger 10. Heat is supplied by coolant inside the tubes 9, 11 and heat exchanger 10 from the internal combustion engine 6 to the working fluid in the housing 1.

After a complete warm-up of the hydraulic system, the internal combustion engine 6 is turned off. The warm-up system of the construction machine hydraulic tank is prevented by the action of hot exhaust gases, heat transfer from the coolant and electricity. The proposed system of warming up the hydraulic tank of a construction machine can operate in the mode of maintaining the operating temperature of the SDM at technological stops.

Since the main engine is warming up faster than the standard hydraulic system of a construction machine, it is recommended that the main engine be started up after the warm-up system of the construction machine's hydraulic tank has been running for some time. After that, it is possible to start the main engine of the construction machine. The output of the hydraulic system of the construction machine to the working temperature is faster than the output to the working temperature without prior use of the system of heating the hydraulic tank of the construction machine.

Claims (1)

The heating system of the construction machine hydraulic tank, including the housing, cover, drain line, pressure line, walls, internal combustion engines, coils, exhaust tract, pipes, heat exchangers, characterized in that one of the heat exchangers is connected to the exhaust tract of the internal combustion engine, and the second heat exchanger is connected by pipes to the internal combustion engine , coils are placed around the drain and pressure lines and are connected to the internal combustion engine cables, heat exchangers and coils are located inside the case.

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