SU981641A1 - Apparatus for facilitating i.c. engine starting - Google Patents

Description

The invention relates to mechanical engineering, in particular to engine-building, namely to devices for. facilitate the start of the internal combustion engine.

A device for facilitating the start of an internal combustion engine is known, comprising a heat source, heaters placed in the engine crankcase in direct contact with the crankshaft crankshaft bearing caps, and the heat from the source to the heaters flj.

However, the known device does not allow for quick and uniform heating of the crankshaft bearings, which reduces the efficiency of engine start.

The aim of the invention is to increase the efficiency of the launch.

The goal is achieved by the fact that in a device for facilitating the start of an internal combustion engine containing a heat source, heaters placed in the crankcase in direct contact with the crankshaft main bearing caps and the heat conductor from the source to the heaters.

the latter, in places of contact with the lids, are provided with condensation cavities, separated by fins, and the heat conductor is made in the form of a coil, steam line and condensate line, and the latter communicate the coil with condensation cavities, the coil being placed in the heating zone of the heat source, and the condensate line

10 is equipped with a container and two valves, one of which is installed at the entrance to the container, and the other at the outlet of it.

The heat source is made in the form

15 liquid preheater with discharge pipe, and the coil is placed in the latter.

Fig. 1 shows the device in Fig. 2 — a schematic diagram of the combination of the condensation cavities of the heaters.

The device contains a heat source made in the form of a liquid heater 1 with an exhaust pipe 25 com 2, heaters 3 placed in the crankcase 4 of the engine 5 in direct contact with the covers 6 of the main bearings 7 of the crankshaft 8 and fitted at the points of contact with

30 with lids 6 by condensation cavities 9, separated by ribs U, and a heat conductor from preheater 1 to heaters 3, made in the form of a coil 11, a steam line 12 and a condensate conduit 13, and the latter are reported to a coil. 11 with condensation cavities 9, the coil 11 is placed in the outlet nozzle 2 of the preheater 1, and the condensate line 13 is provided with a container 14 with a working fluid and two valves 15 and 16, of which the valve 15 is installed at the entrance to the tank 14 and the valve 16 is leaving it.

A floating piston 17 with a diaphragm 18 is placed in the container 14 on the surface of the working fluid. In the over-piston cavity of the container 14 a spring 19 is installed that creates the necessary pressure of the working fluid, which can be used as a low-freezing fluid, such as a water-alcohol mixture. The device works as follows.

During ignition, preheater 1 starts heating engine coolant 5 by circulating it through preheater heat exchanger 1. Engine oil in engine crankcase 5. It is heated by hot gases coming out of preheater 1. At the same time, boiling up of working fluid in coil 11 is washed by hot gases leaving the outlet 2 of the preheater 1. The resulting vapor displaces the liquid from the steam line 12 and the cavities 9 of the heaters 3 through the condensate line 13 through the fluid flow valve 15 b 14, while compressing the spring 19 above the piston 17, displacing the liquid from the coil 11 directly into the container 14 prevents the valve 16 closed by the pressure of steam. When the heaters 3 are reached, the steam condenses on the surfaces forming the cavities 9 and transfers heat to the walls of the heaters 3 and then through the covers 6 to the bearings 7 of the crankshaft 8. The process of steam condensation is accompanied by a drop in pressure in the cavity 9 of the heaters 3, and accordingly in the coil 11. Due to the pressure difference formed between the steam circuit (coil 11, polo) whith the steam pipe 9 and 13). The container 15 closes the valve 15, and the valve 16 opens, and the piston 17 under the action of the spring 19 forces the liquid from the tank 14 through the valve 16 into the coil 11. When the pressures in the coil 11 and the container 14 equalize, the valve 16 closes and the cycle repeats.

 The device can equally be applied to air-cooled engines.

Thus, the use of heaters equipped with condensation cavities ensures the creation and maintenance of a high temperature pressure on the outer surface of the crankshaft bearing caps practically from the beginning of operation of the preheater, accelerates the process of heating the crankshaft bearings and thereby increases the efficiency of engine start.

Claims (2)

1. A device to facilitate the start of an internal combustion engine, containing a heat source, heaters placed in the crankcase in direct contact with the crankshaft main bearing caps, and the heat conductor from the source to the heaters, increase startup efficiency, the heaters at the points of contact with the lids are provided with condensation cavities separated by fins, and the heat conductor is designed as a coil, steam line and condensate line and the latter report a coil with condensation cavities, the coil being placed in the heating zone of the heat source, and the condensate line. equipped with a tank and two valves, one of which is installed at the entrance to the tank, and the other - at the exit from it. 2. The device according to claim 1, characterized in that the heat source is made in the form of a liquid preheater with exhaust pipe, and the coil is placed in the latter. Sources of information taken into account in the examination 1. USSR author's certificate 261025, cl. F 01 M 5/02, 1968.