Ice for percussion tools

FIELD: engines and pumps.

SUBSTANCE: proposed engine comprises cylindrical housing with cover and bottom, percussion piston axially spring-loaded and fitted therein, combustion chamber arranged under housing cover, rod end composed of percussion piston second end and bottom, return spring fitted in said rod end and working tool stem extending through the hole on housing bottom outward, vent and bypass channels made in said housing, ignition unit electrically connected with spark plug fitted in housing cover. It differs from known devices in that said housing and piston are made of nonmagnetic material. Besides, this engine includes electronical unit, storage battery, generator, magnet fitted in nonmagnetic main piston, fuel pump, buffer fuel, electrically controlled atomiser and contactless ignition control system.

EFFECT: higher efficiency and reliability.

1 dwg

 

The invention relates to mechanical engineering, in particular to internal combustion engines (ice), and can be used in devices percussion with osrate translational movement of the working body, for example, in the bumper hammers, rotary hammers, vibrators, beaters, etc., for use in construction, mining and other industries.

Known internal combustion engine for an impact tool [A. S. USSR N 1523331, IPC B25D 9/10, publ. 1987], which contains a cylindrical housing mounted in the sleeve. The sleeve is placed a piston pivotally connected with the connecting rod. At the other end of the rod has a head with an axial buffer-barrel. In the past, freely installed a smaller stage two-stage casing of a pneumatic shock absorber. The engine start is made in the form of a wedge-shaped lateral protrusion placed on the head of a rod, a pusher in the form of two shoulders of the lever, a larger shoulder which cooperates with the side surface of the rod, and the bevelled end face periodically in contact with the wedge-shaped side projection. The lifting mechanism is made in the form of two coaxial gears, ratchet pawl and rack rigidly connected with the side surface of the rod.

The disadvantages of the internal combustion engine is that it has a low reliability. The work is based on the principle of the diesel hammer for sabiani the piles, in which the incident energy of the heavy cylinder (or piston) is used for useful work, and to ignite the air-fuel mixture (FA) for the making of a new cycle. This requires a large supply of kinetic energy to bring the compression ratio in the combustion chamber to a value of 1215, for reliable ignition fuel Assembly and the useful work. Therefore, the piston in the internal combustion engine must be either a large mass, or falling from a great height. That, and the other excludes the internal combustion engine of the class hand tools. As in the description of the internal combustion engine is presented as a hand tool, then the above reasons lead to unreliable operation of the engine. The tightness of the combustion chamber is provided with three movable seals, in case of violation of any of them reduced reliability of the self-ignition of the fuel assemblies. The efficiency of the internal combustion engine is significantly reduced due to the fact that the falling piston does not blow directly on the piston-striker, and transfers its energy via a gas cushion in the combustion chamber. Starting gear is constantly in mesh with the piston, which reduces the efficiency and reliability due to the increase of friction pairs and wear. The reliability of a diesel hammer is reduced when the variance of its longitudinal axis from the vertical.

Known internal combustion engine for an impact tool [A. S. USSR N 656825, IPC B25D 9/10, who publ. 1979], which contains a cylindrical housing with a lid and a bottom, accommodated in the housing spring-loaded in the axial direction of the piston-drummer, a combustion chamber formed by the end face of the piston-striker and cap, podporchennuyu cavity formed by the second end and the bottom set in podpornoy cavity recoil spring and coaxially her the shank of the working tool extending through a hole in the bottom out, installed in the lid of the intake and exhaust valves, made in the form of plates with the rod, and an electric ignition circuit, the cover is installed cocking mechanisms of the intake and exhaust valves, each of which consists of two levers, with their ends respectively pivotally connected with the cover and the valve stem, and a spring placed on the levers between their hinge axes, and mechanism of ignition, made in the form of a hinge mounted on the lid of a spring-loaded lever, which periodically communicates the inlet valve, and a rod movably mounted in the cover that interacts with the lever and designed to turn on and off an electric circuit, and the stem of the intake valve is made with an axial channel and the holes in the plate provided between themselves and employees to supply fuel into the combustion chamber.

Disadvantages of internal combustion engines are that, firstly, it has a low operation efficiency, which is the first of the following reasons: the compression ratio is equal to zero, i.e., FA begins to burn at atmospheric pressure, so the energy release is small in relation to volume unit of the fuel assemblies and, as a consequence, it will be weak blow of the piston-drummer on the working tool; the tightness of the combustion chamber, in addition to stationary, is provided with two movable joints, this increases the probability of leakage and decreases the force of the blow, and, secondly, the unreliability of his work, which is due to the following reasons: mnogoplemennosti timing mechanism in the conditions of dynamic loads leads to failure due to tilting, jamming, wear, etc.; the complexity of the adjustment mechanism platoon intake and exhaust valves, because due to temperature effects, gummy deposits, soot, wear modified effort of opening and closing valves; coking channel that controls the opening of an exhaust valve; the unreliability of the node ignition expressed in jamming of the moving parts of the mechanism of retention in the sludge, the possibility of welding of the contacts, the complexity of the adjustment of the ignition timing; the lack of a releaser; the lack of cooling of the piston, which leads to fading of lubrication; termination in the event of a misfire, since the compression stroke recoil equal to the full speed of the piston. Nesporova the FA will not be able to push the piston up to the opening of the outlet channel due to the constant counteraction of the spring, so not going to happen charge of fresh fuel assemblies.

The closest technical solution, selected as a prototype, is an internal combustion engine for an impact tool [patent RU 2116188, IPC B25D 9/10, publ. 27.07.1998,] containing a cylindrical housing with a lid and a bottom, accommodated in the housing spring-loaded in the axial direction of the piston-drummer, a combustion chamber formed by the end face of the piston-striker and cap, podporchennuyu cavity formed by the second end and the bottom set in podpornoy cavity recoil spring and coaxial with the shank of the working tool extending through the opening in the bottom of the outside, and the combustion chamber at the end of the stroke of the piston-striker consistently connects with the atmosphere and podpornoy cavity through is made in the case of the exhaust and vent channels, and the ignition unit is electrically connected to the spark plug, installed in the housing cover, and with contacts control ignition timing.

The disadvantages of the prototype are to use a return spring, which stores energy for movement of the piston-striker up and compression FA. Due to the large deformation of the spring when the piston is moved-drummer happen fairly large loss of energy stored in moving down the piston. The second disadvantage of the prototype is the presence of FA in podborski the second cavity. Since the strokes of the piston-drummer about the shank of the working tool may cause a spark, it can cause the ignition of the fuel assemblies and damaged housing. A third disadvantage of the prototype is the use of historically obsolete carburetor and mechanical breaker contacts for receiving electrical sparks. The fourth disadvantage is the need to use nepodrojaemaya in the process of electric batteries for the operation of this circuit breaker.

Task to be solved by the proposed invention is directed, is to increase the efficiency and reliability of the internal combustion engine.

The technical result of the invention is to improve the efficiency and reliability of the internal combustion engine due to the failure to use carburetor, mechanical breaker contacts and enable pazaryeri the device battery in the process.

The technical result is achieved in that the internal combustion engine for an impact tool, containing a cylindrical housing with a lid and a bottom, accommodated in the housing spring-loaded in the axial direction of the piston pin, the combustion chamber under the cover, podporchennuyu cavity formed by the second end of the piston-drummer and bottom, installed in podpornoy cavity of the TP is based spring and coaxially with it by the shank of the working tool, go through the hole in the bottom of the casing to the outside, is made in the case vents and overflow channels, ignition module, electrically connected with the spark plug installed in the cover, what's new is that the engine contains a non-magnetic cylindrical body further comprises a non-magnetic main piston and the main podporchennuyu cavity between it and the piston-drummer, the electronics, the battery and generator, comprising a fixed coil on the housing and mounted in non-magnetic main piston magnet, fuel pump, fuel buffer tank and electrically driven jets, as well as contactless control system ignition timing, comprising a fixed control coil on the body.

Differences between the proposed technical solution from the prototype is that the engine contains a non-magnetic cylindrical body further comprises a non-magnetic main piston and the main podporchennuyu cavity between it and the piston-drummer, the electronics, the battery comprising a fixed coil on the housing and mounted in non-magnetic main piston magnet, fuel pump, fuel buffer tank and electrically driven jets, as well as contactless control system ignition timing, comprising a fixed direction is atusko on the body. These differences allow to draw a conclusion on the conformity of the proposed technical solution the criterion of "novelty".

The combination of the above distinctive features of the prototype characteristics are not identified in other technical solutions in the study of this and related areas of technology and, therefore, provides the claimed solution according to the criterion of "inventive step".

The invention is illustrated in the drawing.

The drawing shows a schematic diagram of the proposed internal combustion engine for an impact tool. The engine consists of a non-magnetic cylindrical body 1, which progressively moves the non-magnetic main piston 2. Between the cover nonmagnetic cylindrical body and the upper end face of the main piston is formed a sealed combustion chamber 3, which is formed and ignited the fuel-air mixture (FA). Below the main piston in a non-magnetic cylindrical housing is the main podpornega area 4, in the middle part of which is at the same level in the nonmagnetic cylindrical body is cut several outlet channels 5, United with the atmosphere. Inside the non-magnetic main piston in an axially drilled hole is cylindrical powerful magnet 6. With both ends of the magnet is surrounded by a magnetic circuit in the form of two magni is omagic (ARMCO iron, electrical steel, permalloy and alsever) cylindrical inserts 22.

In the middle part of the nonmagnetic cylindrical body coaxially around him is a series of 7 short cylindrical coils of the generator, electrically connected to fixed on the housing of an electronic unit 8, in which the variables electromotive force (EMF) induced in these coils are straightened, providing the power of the engine constant operating voltage and pajarera the accumulators 9, located in the electronic unit.

Slightly below the upper edge of the outlet channels 5 in the nonmagnetic cylindrical body 1 cut hole, into which extends the upper edge of the overflow channel 10 in the form of curved pipes located outside the non-magnetic cylindrical body. The lower edge of the overflow channel 10 through another hole in the nonmagnetic cylindrical housing is connected with the lower part of the main podpornoy region 4. Below this region the bypass channel 10 inside of the nonmagnetic cylindrical body 1 is spring-loaded piston-striker 11. Between the lower end of the piston-striker and the bottom of the nonmagnetic cylindrical body 1 is more podpornega region 12 within which is located the return spring 13 to return the piston-drummer in the outcome of the second position, and coaxially with the nonmagnetic cylindrical body, the shank of the working tool 14 extending through the hole in the bottom of the casing to the outside.

In the upper part of the nonmagnetic cylindrical body coaxially around him is cylindrical control coil 15. For education in the combustion chamber of the fuel Assembly on the lid of the nonmagnetic cylindrical body is electrically operated fuel injector 16, and an electric candle 17. Candle 17 is connected to the ignition coil 18. Fuel injector 16 is connected to the buffer fuel capacity 19 providing the nozzle with the necessary fuel pressure. When this buffer fuel tank is also connected with the electric fuel pump 20 which pumps it to the fuel (gasoline) from the fuel tank 21 connected to the nonmagnetic cylindrical body.

The engine works as follows.

When ignited from the spark plug 17 of the combustible mixture in the combustion chamber 3 (Fig. 1) non-magnetic main piston 2 under high pressure burned gas moves inside of the nonmagnetic cylindrical body 1 down in the main podpornoy region 4 with the rapidly increasing speed. When it reaches the boundaries of the outlet boxes 5, cut in the housing 1, the burnt gases flow out through these Windows. Next, the nonmagnetic main piston inertia moves down,crossing the upper boundary of the windings of the coils 7 of the generator. By changing the magnetic field transmitted from the magnet 6 through the magnetic circuit 22 to the outside of the nonmagnetic cylindrical body 1, these coils will be picking up the variable EMF, which in the electronic unit 8 is converted into a DC voltage, and is also used to charge the battery 9.

Upon further movement of the main piston down and crossing his bottom end of the lower border of the outlet ports 5, the air in the lower part of the main podpornoy region 4 will begin to shrink and to flow through the bypass channel 10 into the combustion chamber 3, ventilating it from the remnants of the burnt gases.

When crossing the main piston to the lower boundary of the overflow box 10, the air in the lower part of the main podpornoy region 4 between the two pistons will shrink quickly, exerting great pressure on the fixed piston-striker 11. Under the action of this pressure, according to the law of the elastic collision of the masses of both pistons, piston-striker will begin to move downward, compressing the air in the additional podpornoy region 12 and a return spring 13, while the non-magnetic main piston will bounce up.

When you tap the bottom end of the piston-drummer upper boundary of the shank of the working tool 14 impulse piston-striker will be transmitted to the working tool, thereby providing the necessary fur the practical action.

This non-magnetic main piston under high pressure compressed air between the pistons will move with increasing speed up. At the intersection of the lines of the windings of the coil 7 will be picking up a new impetus to EMF, which again will be able to recharge the battery 9. When crossing the upper end of the main piston upper boundary of the outlet window 5 the air in the upper part podpornoy region 4 forming the combustion chamber 3, will begin to shrink, preparing the next working cycle. At the intersection of the non-magnetic main piston border control windings of the coil 15 in its windings will be picking up momentum EMF, which is used for forming the electronic unit 8 pulse opening the fuel injector 16, the injection of fuel (gasoline) into the combustion chamber with further education FA.

Synchronously with the necessary delay in the electronic unit 8 will be formed the ignition pulse supplied to the ignition coil 18 and the calling in electric spark at the spark 17. This causes an explosion of fuel to the combustion chamber 1 and repeat the cycle.

To start the engine around a non-magnetic cylindrical body without a gap, in the region between the two coils, opposite the non-magnetic main piston is located a split ring (not shown) of magnetic m the material (ARMCO iron, electrical steel, permalloy and alsever) having a slit for passing through it a curved pipe overflow channel 10. Due to the closure of the magnetic flux passing through the magnet 6, the magnetic circuit 22, a non-magnetic body 1 and the ring, it will be held in front of the main piston with sufficient force (~30 m). With a sharp motion of his hand split ring upwards, to the control coil 15 nonmagnetic main piston will synchronously move upward, compressing the air in the combustion chamber 3 and starting a new cycle of operation.

Increase the reliability of the proposed motor is due to the fact that instead of cooking fuel Assembly in the carburetor and its pumping from podpornoy region in the combustion chamber (CC) FA is formed directly at the COP when fuel injection from the fuel buffer tank through the electrically controlled injector. Also instead of using return springs for the return movement nonmagnetic main piston use of the elastic properties of air when it is compressed, which reduces energy loss. To enhance the reliability of the results the use of an electric generator, comprising a fixed coil and moving them relatively to the magnet, mounted in non-magnetic main piston and having a magnetic circuit.

The internal combustion engine e is I of an impact tool, containing a cylindrical housing with a lid and a bottom, accommodated in the housing spring-loaded in the axial direction of the piston pin, the combustion chamber under the cover, podporchennuyu cavity formed by the second end of the piston-drummer and bottom, installed in podpornoy cavity recoil spring coaxial with her shank of the working tool extending through the opening in the bottom of the casing to the outside, is made in the case vents and overflow channels, ignition module, electrically connected with the spark plug installed in the housing cover, wherein the engine includes a non-magnetic cylindrical body, further comprises a non-magnetic main piston and the main podporchennuyu cavity between it and the piston-drummer, the electronics, the battery and generator, comprising a fixed coil on the housing and mounted in non-magnetic main piston magnet, fuel pump, fuel buffer tank and electrically driven jets, as well as contactless control system ignition timing, comprising a fixed control coil on the body.



 

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