CN201763403U

CN201763403U - Power device using exhaust valve asynchronous mechanism and multi-inlet turbine

Info

Publication number: CN201763403U
Application number: CN2010202090989U
Authority: CN
Inventors: 张�荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-05-31
Filing date: 2010-05-31
Publication date: 2011-03-16
Anticipated expiration: 2020-05-31

Abstract

The utility model discloses a power device using an exhaust valve asynchronous mechanism and a multi-inlet turbine. The power device comprises a turbine with two or more inlets, an internal combustion engine, the exhaust valve asynchronous mechanism and connecting pipelines, wherein the internal combustion engine is provided with a plurality of air cylinders, and each air cylinder is provided with two or more exhaust valves; the exhaust valve asynchronous mechanism enables the plurality of exhaust valves of each air cylinder to be opened and closed asynchronously by using different cam profiles; and the connecting pipelines between the exhaust valves and the inlets of the turbine lead high temperature and high-pressure waste gas discharged by the exhaust valves to the different inlets of the turbine. The power device provided by the utility model can broaden the range of the rotational speed of an engine corresponding to the high efficiency working space of the turbine, and meanwhile improve the economical efficiency of fuel oil.

Description

Use the power plant of exhaust valve asynchronous mechanism and multiple entry turbine

Technical field

The utility model is applied to use turbo machine to reclaim the exhaust energy of internal-combustion engine.The internal-combustion engine is here contained two-stroke and four-stroke Spark ignition type and compression ignition engine, and rotary engine.

Background technique

The exhaust energy that uses turbo machine to reclaim internal-combustion engine is that the exhaust of High Temperature High Pressure is imported the turbine acting from the cylinder of internal-combustion engine, makes its high speed rotating; Drive other device (such as pressurized machine) by turbine shaft.This is that a kind of pursuit more makes full use of energy in the exhaust, to improve the technological means of internal combustion oil gas Economy.When the turbine drives pressurized machine improves the suction pressure of internal-combustion engine, just constitute turbocharging internal-combustion engines.Here be that example illustrates background technique with the turbocharging internal-combustion engines.Fig. 1 is a kind of on-link mode (OLM) of comparatively common multi-cylinder turbocharging internal-combustion engines: the exhaust of a plurality of cylinders is connected to common exhaust manifold, enters the turbine acting then.

(such as four cylinders, six-cylinder engine) under the certain situation arranged, and the Placement of Fig. 1 has negative influence.In exhaust process, at the initial stage of exhauxt valve opens, the gas in the jar temperature and pressure is all very high, and exhaust velocity is fast, thereby makes the pressure in the exhaust manifold improve rapidly; After this, in-cylinder pressure descends; When exhaust process drew to an end, intake valve began to open, and at this moment, the inlet and outlet door is opened simultaneously, the interference that intake process will be deflated.In the multi-cylinder boosting internal combustion engine that connects as figure one, for the four-cylinder that firing order is 1-3-4-2, if the 3rd cylinder is in the early stage of exhaust, and simultaneously, the 1st cylinder is in exhaust latter stage, and the high pressure of the exhaust manifold that causes of the 3rd cylinder will have a negative impact to the air inlet of the 1st cylinder so.On this basis, produced the multiple entry turbine.In a multiple entry turbine, the pressure pulse of each inlet can be isolated partially or completely, thereby makes that the exhaust pressure pulse of each cylinder can be isolated or weaken greatly mutually in single inlet turbine.In the multiple entry turbine, more two inlet turbines.Provided the connection of on one four cylinder turbocharging internal-combustion engines, using two inlet turbines among Fig. 2.In a four-cylinder, often the 1st, 4 cylinders are linked to each other, insert an inlet of two inlet turbines; The 2nd, 3 cylinders are linked to each other, insert another inlet.In this Placement, the 360 ° of crank angles in the 1st, 4 cylinder spaces, and the exhauxt valve opens duration generally far below 360 ° of crank angles, like this, the exhaust pulses of the 1st, 4 cylinders can not influence each other; And the 2nd, 3 cylinders are access in another turbine inlet, so their exhaust pulses also can be isolated the influence of the 1st, 4 cylinders or weakening greatly.

On multi-cylinder engine, use the multiple entry turbine, can effectively avoid influencing each other of multi-cylinder engine exhaust pulses.But for the connection as Fig. 2, the flow of each turbine inlet is identical.And for turbo machine, underfed can cause the turbine inlet pressure little, and the energy in the engine exhaust can't effectively utilize, and shows as the pressurized machine end and can not produce enough boost pressures on turbocharging internal-combustion engines; Excessive then can causing of flow blocks, and makes that the turbine inlet pressure is excessive, and just the engine exhaust back pressure is excessive, reduces the fuel economy of motor.Therefore for any turbo machine, a desirable range of flow is arranged all, the lower limit that is lower than this flow shows as the boost pressure deficiency; Phenomenons such as the upper limit that is higher than this flow shows as fuel economy and descends rapidly, and the interior delay of cylinder waste gas is too much.Correspondingly, turbosupercharged engine often can only be in certain speed stage efficient operation.

Introduce background technique though it should be noted that top use turbocharging internal-combustion engines, the application that any use I. C. engine exhaust drives turbo machine all can run into similar problem.

The model utility content

Efficient operation section during for effectively expansion internal-combustion engine and turbine match, reduce simultaneously motor exhaust back pressure, improve fuel economy, a kind of device of new use multiple entry turbine is proposed here.

According to one side of the present utility model, a kind of power plant of exhaust valve asynchronous mechanism and multiple entry turbine that use comprise: the turbo machine that two or more inlets are arranged; Internal-combustion engine has a plurality of cylinders, and each cylinder has two or more exhaust valves; The exhaust valve asynchronous mechanism makes the asynchronous opening and closing of a plurality of exhaust valves of each cylinder by using different cam profiles; Connecting pipeline between exhaust valve and turbine inlet is with the high temperature of exhaust valve discharge, the difference inlet that high pressure exhaust gas connects into turbo machine.

In addition, high temperature, pressurized gas enter from the inlet of turbo machine, flow out from the outlet of turbo machine, thereby acting drive turbo machine.

In addition, turbo machine is the power source that is used for driving pressurized machine, generator etc.

In addition, internal-combustion engine comprises two-stroke or four-stroke spark ignition or compression-ignited reciprocating IC engine, and rotary engine.

In addition, exhaust valve and connecting pipeline between turbine inlet are used for the exhaust valve of the asynchronous opening and closing of each cylinder is connected with different turbine inlet respectively.

The utility model separates the active exhaust and the passive exhaust of I. C. engine exhaust, make it to enter different turbine inlets, to produce two exhaust manifolds: high pressure gas house steward (the also exhaust manifold that promptly links to each other) and low pressure exhaust house steward (the also exhaust manifold that promptly links to each other) with the exhaust valve of the later opening and closing of each cylinder with the exhaust valve of each cylinder opening and closing in advance.Like this, can make full use of the pulse energy of I. C. engine exhaust, the turbine inlet that the high pressure gas house steward is connected has high pressure, high flow capacity, thereby reaches efficacious workaround as early as possible; The turbine inlet that makes the low pressure exhaust house steward connect simultaneously has low pressure, low discharge, thereby reduces exhaust back pressure.So just reached and widened the turbo machine efficacious workaround, improved the purpose of fuel economy simultaneously.

Description of drawings

By the description of certain exemplary embodiments being carried out below in conjunction with accompanying drawing, above and other aspect of the present utility model and exemplary advantage will become clearer and be easier to and understand, wherein:

Fig. 1 is to use typical case's four cylinder turbocharging internal-combustion engines schematic representation of single inlet turbine;

Fig. 2 is to use typical case's four cylinder turbocharging internal-combustion engines schematic representation of two inlet turbines;

Fig. 3 A is that each cylinder has the connection diagram of the four-cylinder internal combustion engine of two exhaust valves when using two inlet turbine;

Fig. 3 B is the exhaust valve lift schematic representation corresponding to Fig. 3 A, wherein gives the synchronous valve lift of two existing exhaust valves as a reference.

Embodiment

Here with every cylinder the four-cylinder internal combustion engine of two valves and the cooperation of two inlet turbo machines being arranged is that example illustrates its using method.The concrete connection is shown in Fig. 3 A, and corresponding exhaust valve lift is shown in Fig. 3 B.In the example of Fig. 3 A and Fig. 3 B, each cylinder has two exhaust valves, and these two exhaust valves are asynchronous, insert two exhaust manifolds respectively: at first the valve of opening inserts the high pressure gas house steward, represents with solid line in Fig. 3 A; The valve of opening evening inserts the low pressure exhaust house steward, represents with dot and dash line in the drawings.The exhauxt valve opens duration of high and low pressure exhaust valve unlatching duration separately compared to the synchronous basic property of two exhaust valves can shorten to some extent, and correspondingly, valve lift also can reduce.Concrete molded lines need be optimized according to the different parameters and the production technology of application certainly.Here provide an example:

At first, the exhauxt valve opens duration of supposing the basic model that two exhaust valves are synchronous is 240 ° of crank angles.Then in the asynchronous scheme of exhaust valve, the high and low pressure exhaust valve unlatching duration separately can all be got 200 ° of crank angles, and its valve lift then may need corresponding reduction; Being opened to the low pressure exhaust door from the high pressure gas door closes and can get 240 ° of crank angles.Simultaneously, exhaust valve size constancy.On this basis, connect exhaust valve and two inlet turbo machine with compact as far as possible pipeline.The compactness here is reflected at two aspects, and the one, the sectional area of pipeline can be as far as possible little; The 2nd, the length overall of pipeline can be lacked as far as possible.The net sectional area of gas exhaust manifold and exhaust manifold can be identical, but should be less than the maximum valid circulation area of exhaust valve.

In above example, exhauxt valve opens duration (total unlatching duration of high and low pressure exhaust valve) and valve size all remain unchanged, so that reduce to minimum to the influence of engine cycle and structure.But, in practice, also obviously be fine according to concrete type change exhauxt valve opens duration, exhaust valve size.

Claims

1. power plant that use exhaust valve asynchronous mechanism and multiple entry turbine is characterized in that described power plant comprise:

The turbo machine that two or more inlets are arranged;

Internal-combustion engine has a plurality of cylinders, and each cylinder has two or more exhaust valves;

The exhaust valve asynchronous mechanism makes the asynchronous opening and closing of a plurality of exhaust valves of each cylinder by using different cam profiles;

Connecting pipeline between exhaust valve and turbine inlet is with the high temperature of exhaust valve discharge, the difference inlet that high pressure exhaust gas connects into turbo machine.

2. power plant according to claim 1 is characterized in that, high temperature, pressurized gas enter from the inlet of turbo machine, flow out from the outlet of turbo machine, thereby acting drive turbo machine.

3. power plant according to claim 1 is characterized in that, turbo machine is the power source that is used for driving pressurized machine, generator etc.

4. power plant according to claim 1 is characterized in that, internal-combustion engine comprises two-stroke or four-stroke spark ignition or compression-ignited reciprocating IC engine, and rotary engine.

5. power plant according to claim 1 is characterized in that, exhaust valve and connecting pipeline between turbine inlet are used for the exhaust valve of the asynchronous opening and closing of each cylinder is connected with different turbine inlet respectively.