Background of invention There is known a power plant which contains a steam boiler, a turbine with a condensator equipped with a circulating circuit and a heat utilizer - cleaner of exhaust gases with the areas of wet cleaning and condensing, the latter of them there is supplied by a surface heatexchanger-condensator connected at the inlet with the outlet main from the circulating circuit of the turbine condensator and at the outlet with the heat consumer, where as said heat consumer can be used an additional turbine and a condensator, the exit of which is connected with the inlet main of the circulating circuit.( SU, Al, 785570) The plant only provides limited economy, conditioned by low efficiency because of big energy loss in a steam and condensing blocks.

There is known a Sterling multycylinder engine of double action, containing as heat conducting elements primary and secondary heat pipes, the engines cylinders are located V-shapely; the secondary heat machine embraces the heater pipes and the heat-absorbing areas of the primary heat pipes. The heating space with a combustion chamber and a primary heat pipes block are placed in the cavity between the cylinders.(SU, AI 1617173).

This Stirling engine of double action is characterized by complication in the production technology of the heatexchanger of a primary and secondary circuit, and the applied heating scheme to be realized in this engine does not allow to achieve the efficiency above 0.25.

There is known a power plant including a piston-type pump, a cylinder, a butt- end partition dividing an engine cylinder into two volumes, one of them is a pump chamber; inside the cylinders there is a displacing piston and a working piston connected with a pump piston; including also an expansion cavity, a compression cavity and a buffer cavity, thereby, the expansion cavity and the compression cavity are connected with fixed in sequence a heater, regenerator and cooler, made in the form of

a heating pipe, fixed into a central hole of the partition and secured on the cylinder, heating pipe condensation area is located in the pump chamber, and the heating pipe evaporation area is located in the compression cavity; the pump chamber is equipped with the valves to input and output the overpumped liquid.(SU, AI, 1671930).

The plant is characterized by complication of a piston and valve mechanism synchronizing due to that the whole plant can work instable, what prevents from obtaining ecologically clean waste combustion products.

There is known the engine with the external heat exchange of the working body containing compression cylinders and expansion cylinders of the working body, a heat exchanger (SU, AI, 1815385).

This device is an engine working on a Stirling cycle, containing six cylinders, in each cylinder there is fixed a piston with a piston -rod dividing the cylinder volume into a hot and a cold cavities, the pistons of all cylinders are connected through the crankshaft by the drive mechanism to be placed in the crankcase, the drive mechanism is made as a rodless power mechanism with a four- support crankshaft, including three worm journals, located relatively one to another at the angle of 120, on each of them two intermediate links are mounted by a socket joint, which ones are jointly connected with the corresponding slider connected with the piston- rod and fixed in guides made in the crankcase co-axialy with the cylinder.

This device is characterized by troubles in keeping balance, by vague bounds of a hot and a cold cavities due to heat overflow, what finally decreases the efficiency. The efficiency of the machines, working in this way is restricted by value 0.2 There are known the methods to increase the economy and to improve the environment ecology in the heat machines (G.WALKER "Machines working on Stirling Cycle "Moscow, "ENERGIA", 1978) These methods include the fuel combustion and the execution of the working cycle with the working body cooling by blowing off the heat-absorbent medium through the heat exchanger -cooler.

These methods are characterized by: -insufficiently complete use of the fuel heat energy supplied to the working parts of the heat machine, - insufficiently high thermodynamic efficiency of the working body cycle in the heat machine,

- insufficiently high economy of dynamic working parts of heat machines cylinder-piston blocks, in particular.

Disclosure of Invention It was aimed to work out the engine with external heat exchange of the working body, which could ensure the rise in the efficiency, as well as in the specific capacity providing high ecological indices of the environment.

This aim was achieved by the present invention.

In the engine with external heat exchange of the working body, containing compression cylinders, expansion cylinders of the working body and heat exchangers, according to the invention, the compression cylinders are fixed to be divided into not less than two groups, thereby, a volume of the cylinders of the first in the direction of the working body movement group is larger,than the volume of the last group; the expansion cylinders are fixed to be divided into not less than two groups; thereby, the volume of the first in the direction of the working body movement group is smaller than the cylinders volume of the last group, and between these groups the intermediate heat exchangers are fixed.

In particular, the compression cylinders and expansion cylinders may be fixed to be divided into two groups, thereby, the volumes ratio of the compression cylinders groups is 4:1-1.5:1 and that one of the expansion cylinders is relatively 1:1.5 - 1:4 in the direction of the working body movement.

In a preferable version, the engine as to this invention contains an additional heat exchanger fixed in the upper part of the combustion chamber, the outlet of which is connected with the block supplied the air into the combustion chamber, and the inlet is connected with the outlet of the heat-absorbing circuit of the working body heat exchanger-cooler.

In this version of design, the engine according to the invention can contain adjustable holes, located between the outlet of the additional heat-exchanger- heater and the block supplied the air into the combustion chamber.

On the internal surface the heat machines piping can contain the screw areas in particular, star-shaped in cross-section.

Not less than two groups of the compression cylinders to be available allow to carry out additional compressing of the working body, having been compressed in the first group, what finally increases the efficiency of the device. Between the groups of the compression cylinders there are fixed intermediate heat exchanger- coolers allowing to take away the heat from the compressed gas prior to its additional compression, what

also rises the efficiency of the device. A selected ratio of the cylinders volumes allows to provide the maximum efficiency of the device.

5 Not less than two groups of the expansion cylinders to be available allow to carry out additional expansion of the working body, having been already expanded in the first group, what finally rises the efficiency of the device. Between the groups of the expansion cylinders the intermediate heat exchanger-external heaters are fixed, which allow to heat the expanded gas before its following expansion, what also increases the efficiency of the device. A selected ratio of the cylinders volumes allows to provide the maximum efficiency of the device.

Division of the working cylinders into groups with intermediate cooling under compression and intermediate heating under expansion sufficiently increases the thermodynamic efficiency of the working body cycle. The range of the offered volumes ratios of the extreme cylinders groups also allows to minimize the number of the cylinders typesizes.

An additional heat exchanger-heater fixed in the upper part of the combustion chamber is required for extra heating up of the air, preheated in the heat-absorbing circuit of the heat exchanger-cooler of the working body. Moreover, in this way the exhausting block of combustion products is being cooled and in consequence its premature combustion is being prevented and its durability increases.

Adjustable holes located between the outlet of the additional heat exchanger- heater, and a block to supply the air into the combustion chamber provide the possibility to regulate the amount of heated air supplied into the combustion chamber.

This additional air having a higher temperature than the external air supplied for combustion allows to provide a higher efficiency of the fuel combustion without additional energy supply for the air preheating and, in consequence, rises the device efficiency in the whole. Since these holes are adjustable, the optimum regime of the fuel combustion can be provided via the variable throughpass cross-section.

Screw areas are required to create a torque flow of the working body in the piping relatively to its axis what provides the flow movement in the piping to be stable.

It is especially important, if the piping have on their internal surfaces the screw areas, star-shaped in cross-section, the latter are required to decrease the friction resistance under the following movement of the working body in the piping of a round cross- section.

This problem was also solved by another invention, namely by a method to run the engine with the external heat exchanger of the working body, which is a way to increase the economy and to improve the environment ecology in heat machines.

In this method to increase the economy and to improve the environment ecology in the engine with the external heat exchange of the working body including the fuel combustion, the execution of the working cycle with the working body cooling by blowing off the heat-absorbing medium through the heat exchanger, according to this invention, the fuel combustion is carried out when the heat-absorbing medium having been heated in the heat exchanger is being supplied to the fuel.

If this method is carried out in the cylinder-piston machines with the outlet valves, when the working body is being exhausted from the cylinder, the outlet valves are being closed until the cylinder piston reaches the dead point and by the following movement of the piston to the dead point, the pressure is formed in a bad volume above the piston mirror in the range from the initial pressure in the cylinder up to the working pressure.

The working body travel can be carried out in the form of a flow with a cross- section shape different from a cross-section shape of the piping, in particular, with a star-shaped flow cross-section with the flow rotation around the axis of travel.

When a part of heat-absorbing air at the outlet from the cooler according to this method are directed into the external combustion chamber to burn out the fuel, this air preheated in the cooler has the temperature higher than the temperature of the main mass of the air, supplied from outside for fuel combustion. Thus, extra heat is supplied into the combustion chamber, which decreases the energy consumption to heat the gas mixture up to the ignition temperature and, in consequence, allows to increase the temperature of the combustion products at the outlet of the combustion chamber without fall of its power efficiency. This temperature rise allows to use additionally the energy of the combustion products with the aim to produce extra heat and electric energy, what promotes the efficiency rise of this device working by this method. Thereby, the conversion of low potential heat of the cooling air at the outlet from the heat exchanger-cooler of the working body into high potential heat actually takes place. Moreover, due to supply of extra air into the combustion chamber, the completeness of the fuel combustion is enhanced.

Finally, this method allows to provide ecological improvement. Actually, if the surrounding air contains pollution in a drop-liquid state, preheating of such an air

allows to convert partially these pollution from the drop-liquid state into gaseous form, what.p,rovides their complete combustion after supply into the combustion chamber.

Thus, dangerous admixtures prior to be contained in the surrounding air burn out what finally promotes the purification of the surrounding air.

If the method of the energy conversion is carried out in the cylinder-piston machines with the outlet valves, when the working body is being exhausted from the cylinder its required part is preferably being preserved in the cylinder, which is sufficient to create the working pressure in a bad volume above the piston mirror in the range from the initial pressure in the cylinder up to the working pressure. Thus, when the working body is being exhausted from the cylinder, its required part is being kept in the cylinder, which is sufficient to create the working pressure in a bad volume above the piston mirror. Technically, it can be done, for example, by way of closing the outlet valve before the piston achieves the upper dead point. Thereby, the valve movement control can be carried out by means of a profiled cam, connected with the crankshaft of the cylinder- piston machine.

Actually, if this operation is not carried out, the working body in a bad volume above the piston mirror will be under the initial pressure. When the next gas portion is being supplied, a part of the work will be consumed to increase the pressure in a bad volume up to the working pressure, and this work will be considered as the loss. If a part of the working body is being kept in the cylinder to be compressed up to the working pressure when the cylinder travels to its bottom, this loss will not occur.

The working body travel along the engine piping can be carried out in the regime of the flow with the cross-section shape different from the cross-section shape of the piping, what sufficiently decreases the resistance of air flow movement in the piping due to the friction against the piping walls. The star-shaped flow cross-section is preferable, as providing the minimum loss by friction. To stabilize this flow, the flow rotation around the axes of travel can be created.

Short Description of Drawings The invention is illustrated by the following drawings, where: Fig.l shows the main engine scheme.

Fig.2 shows the engine thermodynamic cycle.

Fig.3 shows star-shaped cross-section of piping.

Detailed Description of Invention

The engine contains two groups of expansion cylinders 1 and 2,3., two groups of cqm>pression cylinders 4,5 and 6, fixed on the common crankshaft 7, a heat exchanger 8 and an intermediate external heater of the working body 9, a fuel combustion chamber 10 with a fuel burner 11, a regenerator 12, an intermediate cooler 13, a cooler 14, a fan 15. Position 16 shows an additional heat exchanger- heater fixed in the upper part of the combustion chamber 10. Between the entrance of the additional heat exchanger 16 and the block pumping the air into the combustion chamber there is an adjustable hole 17 with a throttle 18. The piping areas marked with (*) are made with the screw areas star-shaped in cross-section. A thermodynamic cycle shown in T-S coordinates includes a compression process 1-2, from the pressure P to the pressure P2, a heat-absorbing process from the temperature T2, to the temperature Tg, a compression process from the pressure P2 to the pressure P3 and temperature T4, than a heating process in the regenerator from the temperature T4 to the temperature Ts, a heating process in the heat exchanger of the combustion chamber from the burning temperature Ts to the temperature T6, an expansion process from the pressure P3 to the pressure P2, a heating process in the additional heater from the temperature T7 to the temperature T8, an expansion process from the pressure P2 to the pressure P and to the temperature T9, a cooling in the regenerator from the temperature To to the temperature Tlo and a cooling in the cooler from the temperature Tlo to the temperature T1. Further this process is repeated.

The engine runs in the following way. Compressed up to the pressure P2, the working body from the first group of the cylinders 4 and 5 is supplied into the intermediate cooler 13, where it is cooled down to the temperature T3, after that it travels into the second group of the cylinders 6, where it is compressed up to the pressure P4 and temperature T4. From the cylinder 6 the working body goes into the regenerator 12, where it is heated up to the temperature T5 and then passes into the heat exchanger 8 of the combustion chamber 10, where it is heated up to the temperature T6 at the account of the energy of the fuel, supplied along the pipe. Then the working body enters the first group of the expansion cylinders 1 where it is expanded up to the pressure P2 and the temperature T7, after that it follows into the intermediate heater 9, where it is heated up to the temperature T8. Then the working body goes into the second group of the expansion cylinders 2 and 3, where it is expanded up to the pressure P and the temperature Tg. The efficient work of all the expansion cylinders is sufficiently higher than the work of its compression in all the compression cylinders, due to that a positive torque moment occurs on the

crankshaft 7. From the cylinders 2 and 3 the working body goes into the regenerator 12 where it is being cooled down to the temperature Tlo. After that the working body enters into the cooler 14, where due to the air blowing off by the fan 15 it is cooled down to the temperature T1 and goes into the first group of compression cylinders 4 and 5. The process of the machine operation is repeated in the described consequence. Thereby, a part of heat-absorbing air at the outlet from the cooler 14 is supplied to the entrance into the combustion chamber 10 through the additional heat exchanger 16. The movement of the working body, of the air, of the combustion products and of the fuel is illustrated with the arrows in Figure 1. After passing through the screw areas star-shaped in cross-section, the working body flow is stabilized and passes through the piping with the minimum loss for friction.

Industrial Application.

Most effectively this invention may be applied, in particular to provide the work of the heat electric power stations.