CN111963305A - Six-stroke hybrid engine - Google Patents
Six-stroke hybrid engine Download PDFInfo
- Publication number
- CN111963305A CN111963305A CN202010874765.3A CN202010874765A CN111963305A CN 111963305 A CN111963305 A CN 111963305A CN 202010874765 A CN202010874765 A CN 202010874765A CN 111963305 A CN111963305 A CN 111963305A
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- Prior art keywords
- liquid gas
- cylinder
- communicated
- stroke
- engine
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B41/00—Engines characterised by special means for improving conversion of heat or pressure energy into mechanical power
- F02B41/02—Engines with prolonged expansion
- F02B41/04—Engines with prolonged expansion in main cylinders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B75/021—Engines characterised by their cycles, e.g. six-stroke having six or more strokes per cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
- F02B75/18—Multi-cylinder engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
- F02B75/18—Multi-cylinder engines
- F02B2075/1804—Number of cylinders
- F02B2075/1816—Number of cylinders four
Abstract
The invention discloses a six-stroke hybrid power engine, which comprises an engine body with a cylinder, a liquid gas ejector and a liquid gas supply system, wherein the liquid gas ejector is arranged on the engine body; the air inlet of the cylinder is communicated with the air inlet pipe through an air inlet valve, the air outlet of the cylinder is communicated with the exhaust pipe through an exhaust valve, the piston of the cylinder is connected with one end of a crank connecting rod, and the other end of the crank connecting rod is connected with a crankshaft; the liquid gas supply system is connected with the liquid gas ejector through the liquid gas pipe, the outlet of the liquid gas ejector is communicated with the cylinder, when the exhaust stroke of the cylinder is finished, the liquid gas ejector injects liquid gas into the cylinder, the liquid gas absorbs heat from residual waste gas of the cylinder, and the liquid gas is gasified and expanded to push the piston to do work. The invention has the beneficial effects that: the engine does not need to be additionally provided with a separate cylinder, the expansion work of the liquid gas is also completed in the gas cylinder, the engine is compact in structure, and the related structural design is simple.
Description
Technical Field
The invention relates to an engine taking chemical fuel and liquid nitrogen as power sources, in particular to a six-stroke hybrid engine.
Technical Field
The conventional engine is generally a four-stroke engine (respectively comprising an air inlet stroke, a compression stroke, an expansion stroke and an exhaust stroke), the overall thermal efficiency is low, and one important reason is that in the exhaust stroke, high-temperature exhaust gas carries a large amount of heat to be directly discharged into the atmosphere, so that large energy loss is caused. And the pure liquid nitrogen engine reduces the expansion work-doing capacity because the heat absorbed from the atmosphere is insufficient when the liquid nitrogen is gasified. In order to fully utilize the waste heat of the engine, the prior art has the engine which mixes and utilizes the waste heat of the engine and the waste heat of the engine, the waste gas of a gas cylinder is firstly discharged into a waste gas collector and then is sprayed into a pneumatic cylinder together with liquid nitrogen to do work, or the heat exchanger is utilized to transfer the energy of the waste gas to the liquid nitrogen to absorb heat and gasify the liquid nitrogen to form high-pressure gas and then the high-pressure gas enters the pneumatic cylinder to do work, thereby achieving the purpose of improving the working capacity. However, the existing hybrid engines need to be provided with special pneumatic cylinders, so that the working states of all cylinders are different, and the size of the engine is increased; in addition, other auxiliary equipment such as a heat exchanger or an exhaust gas collector needs to be additionally arranged, the related structural design is difficult, and the cost is greatly increased.
Disclosure of Invention
The invention aims to provide a six-stroke hybrid power engine with reasonable structural design and high energy utilization rate aiming at the defects of the prior art.
The technical scheme adopted by the invention is as follows: a six-stroke hybrid engine includes an engine block with cylinders, a liquid gas injector and a liquid gas supply system; the air inlet of the cylinder is communicated with the air inlet pipe through an air inlet valve, the air outlet of the cylinder is communicated with the exhaust pipe through an exhaust valve, the piston of the cylinder is connected with one end of a crank connecting rod, and the other end of the crank connecting rod is connected with a crankshaft; the liquid gas supply system is connected with the liquid gas ejector through the liquid gas pipe, the outlet of the liquid gas ejector is communicated with the cylinder, when the exhaust stroke of the cylinder is finished, the liquid gas ejector injects liquid gas into the cylinder, the liquid gas absorbs heat from residual waste gas of the cylinder, and the liquid gas is gasified and expanded to push the piston to do work.
According to the scheme, the liquid gas is liquid nitrogen.
According to the scheme, the engine is additionally provided with a heat exchanger, a liquid gas pipeline is communicated with a cold source runner of the heat exchanger through a liquid gas branch, and an outlet of the cold source runner of the heat exchanger is communicated with an inlet of the liquid gas ejector; the heat source flow passage of the heat exchanger is communicated with an external air source or communicated with an exhaust pipe.
According to the scheme, the liquid gas supply system comprises a liquid gas storage tank, and the liquid gas storage tank is connected with the liquid gas injector through a liquid gas pipe.
The invention has the beneficial effects that:
1. the engine does not need to be additionally provided with a separate cylinder, the expansion work of the liquid gas is also completed in the gas cylinder, the engine has a compact structure, and the related structural design is simple; the engine is directly reformed based on the traditional engine, so that the development and manufacturing cost can be greatly reduced, and the later maintenance cost is reduced.
2. The waste gas which participates in heating the liquid gas in the invention does not flow out of the working cylinder, the heat transfer loss is greatly reduced, the unit mass of the waste gas contains more heat, the working capacity is stronger, and the power performance of the engine is greatly improved.
3. Because the low-temperature characteristic and the expansion work absorption of the liquid gas are finished in the gas cylinder, the engine does not need a special cooling system to cool the engine body.
4. The invention can realize the seamless switching of two working modes of traditional four-stroke gas working or six-stroke gas and liquid gas mixed working so as to adapt to the requirements of different running working conditions of vehicles on the power of the engine.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure: 1-cylinder, 2-inlet valve, 3-exhaust valve, 4-exhaust pipe, 5-piston, 6-liquid gas pipe, 7-liquid gas storage tank, 8-liquid gas ejector, 9-inlet pipe, 10-crank connecting rod and 11-crankshaft.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
A six-stroke hybrid engine as shown in fig. 1, comprising an engine block with cylinders 1, a liquid gas injector 8 and a liquid gas supply system; an air inlet of the cylinder 1 is communicated with an air inlet pipe 9 through an air inlet valve 2, an air outlet of the cylinder 1 is communicated with an exhaust pipe 4 through an exhaust valve 3, a piston 5 of the cylinder 1 is connected with one end of a crank connecting rod 10, and the other end of the crank connecting rod 10 is connected with a crankshaft 11; the liquid gas supply system is connected with the liquid gas ejector 8 through the liquid gas pipe 6, the outlet of the liquid gas ejector 8 is communicated with the cylinder 1, when the exhaust stroke of the cylinder 1 is finished (waste gas is not exhausted), the liquid gas ejector 8 ejects liquid gas into the cylinder 1, the liquid gas absorbs heat from the residual waste gas in the cylinder 1, and the liquid gas is gasified and expanded to push the piston 5 to do work. In the invention, the working states of all cylinders are consistent; other configurations of the engine body are known in the art and will not be described in detail herein.
Preferably, the liquid gas is liquid nitrogen. In the present invention, the liquid gas is not limited to liquid nitrogen, and a gaseous inert gas may be used.
Preferably, the liquid gas supply system comprises a liquid gas storage tank 7, and the liquid gas storage tank 7 is connected with a liquid gas injector 8 through a liquid gas pipe 6.
Preferably, the engine is further provided with a heat exchanger, the liquid gas pipe 6 is communicated with a cold source flow channel of the heat exchanger through a liquid gas branch, and an outlet of the cold source flow channel of the heat exchanger is communicated with an inlet of the liquid gas ejector 8; the heat source flow passage of the heat exchanger is communicated with an external air source or communicated with the exhaust pipe 4. In the invention, the liquid gas and the waste gas or the air exchange heat in the heat exchanger, and the liquid gas enters the liquid gas ejector 8 after absorbing heat, thereby improving the working capacity of the liquid gas.
In the embodiment, the engine comprises four cylinders 1, and a piston 5 of each cylinder 1 is connected with the same crankshaft 11 through a crank connecting rod 10; each cylinder 1 is respectively connected with an exhaust pipe 4 through an exhaust valve 3 and is respectively connected with an air inlet pipe 9 through an inlet valve 2; one liquid gas injector 8 is provided per cylinder 1.
The engine of the invention belongs to a six-stroke working mode: an intake stroke, a compression stroke, a gas expansion stroke, a combustion waste gas exhaust stroke, a liquid nitrogen expansion stroke and an exhaust stroke (the traditional engine comprises four strokes of air suction, compression, work application and exhaust); air and fuel enter the cylinder 1 in the intake stroke and the compression stroke and are compressed; in the exhaust stroke of the combustion waste gas, the high-temperature and high-pressure gas generated after the mixed gas is combusted expands to push the piston 5 to do work; in the burnt exhaust gas exhaust stroke, the piston 5 pushes the exhaust gas out of the cylinder 1 from the exhaust valve 3, and the amount of residual exhaust gas is controlled by adjusting the timing (closing timing) of the exhaust valve 3; the liquid gas is stored in a liquid gas storage tank 7 and is delivered to a liquid gas injector 8 through a liquid gas pipe 6. In the expansion stroke of the liquid gas, the liquid gas is sprayed by the liquid gas injector 8, and the liquid gas absorbs heat from the waste gas, and the liquid gas is gasified, and then expands to push the piston 5 to do work; in the exhaust stroke: the piston 5 pushes exhaust gases out of the cylinder 1 through the exhaust valve 3. The specific process is as follows:
1. an intake stroke: the piston 5 starts descending at the top dead center, the exhaust valve 3 is in a closed state, the intake valve 2 is in an open state, and air enters the cylinder 1 until the piston 5 reaches the bottom dead center.
2. And (3) a compression process: the piston 5 starts moving upward at the bottom dead center, the exhaust valve 3 is in a closed state, the intake valve 2 is in a closed state, and air is compressed in the cylinder 1 until the piston 5 reaches the top dead center. In the case of the port injection engine, the mixture of air and fuel is introduced into the cylinder 1 during the intake stroke, and in the case of the direct injection engine, fuel is injected into the cylinder 1 during the intake stroke and the compression stroke.
3. Gas expansion stroke: the piston 5 starts to move downwards at the top dead center, the exhaust valve 3 is in a closed state, the intake valve 2 is in a closed state, and high-temperature and high-pressure fuel gas generated after the mixed gas is combusted expands to push the piston 5 to do work until the piston 5 reaches the bottom dead center.
4. Combustion exhaust stroke: the piston 5 starts to move upwards at the bottom dead center, the exhaust valve 3 is in an open state, the intake valve 2 is in a closed state, and the piston 5 pushes exhaust gas to be discharged out of the cylinder 1 from the exhaust valve 3 until the piston 5 reaches the top dead center. The amount of residual exhaust gas can be controlled by adjusting the timing (closing timing) of the exhaust valve 3.
5. Liquid nitrogen expansion stroke: the piston 5 starts to descend at the top dead center, the exhaust valve 3 is in a closed state, the intake valve 2 is in a closed state, the liquid gas ejector 8 sprays liquid nitrogen, and after the liquid nitrogen absorbing heat from the waste gas is gasified, the liquid nitrogen expands to push the piston 5 to do work until the piston 5 reaches the bottom dead center. Liquid nitrogen is stored in a liquid gas storage tank 7 and is delivered to a liquid gas injector 8 through a liquid gas pipe 6.
6. Exhaust stroke: the piston 5 starts to move upwards at the bottom dead center, the exhaust valve 3 is in an open state, the intake valve 2 is in a closed state, and the piston 5 pushes exhaust gas to be discharged out of the cylinder 1 from the exhaust valve 3 until the piston 5 reaches the top dead center.
The invention adds the components including liquid gas injector 8, liquid gas pipe 6, liquid gas storage tank 7 on the basis of the traditional engine structure, after the traditional exhaust stroke (the residual waste gas amount can be controlled by the exhaust phase of the exhaust stroke, namely exhaust valve 3), liquid nitrogen is injected, and the liquid nitrogen is gasified and expanded to do work and then exhaust. The engine takes chemical fuel and liquid gas (liquid nitrogen or other liquid gas) as power sources, two strokes are added on the basis of the traditional four-stroke engine, the mixed work of chemical fuel combustion and waste gas heating liquid gas in the same cylinder is realized through six strokes, and the specific structure design is as follows: the liquid gas ejector is additionally arranged on the basis of a traditional engine and is communicated with a liquid gas storage tank through a liquid gas pipe, after traditional air inlet, compression, expansion and exhaust strokes are finished (the amount of residual waste gas after the exhaust stroke can be controlled by an exhaust phase of the exhaust stroke, namely an exhaust valve), the liquid gas ejector sprays liquid gas into a cylinder, and the liquid gas absorbs waste heat of the waste gas, gasifies, expands and works and then exhausts.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (4)
1. A six-stroke hybrid engine, comprising an engine body with cylinders, a liquid gas injector and a liquid gas supply system; the air inlet of the cylinder is communicated with the air inlet pipe through an air inlet valve, the air outlet of the cylinder is communicated with the exhaust pipe through an exhaust valve, the piston of the cylinder is connected with one end of a crank connecting rod, and the other end of the crank connecting rod is connected with a crankshaft; the liquid gas supply system is connected with the liquid gas ejector through the liquid gas pipe, the outlet of the liquid gas ejector is communicated with the cylinder, when the exhaust stroke of the cylinder is finished, the liquid gas ejector injects liquid gas into the cylinder, the liquid gas absorbs heat from residual waste gas of the cylinder, and the liquid gas is gasified and expanded to push the piston to do work.
2. A six-stroke hybrid engine according to claim 1, wherein the liquid gas is liquid nitrogen.
3. The six-stroke hybrid engine according to claim 1, wherein a heat exchanger is additionally arranged on the engine, the liquid gas pipeline is communicated with a cold source flow channel of the heat exchanger through a liquid gas branch, and an outlet of the cold source flow channel of the heat exchanger is communicated with an inlet of the liquid gas ejector; the heat source flow passage of the heat exchanger is communicated with an external air source or communicated with an exhaust pipe.
4. A six-stroke hybrid engine as claimed in claim 1 wherein the liquid gas supply system includes a liquid gas storage tank connected to the liquid gas injector by a liquid gas line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010874765.3A CN111963305A (en) | 2020-08-27 | 2020-08-27 | Six-stroke hybrid engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010874765.3A CN111963305A (en) | 2020-08-27 | 2020-08-27 | Six-stroke hybrid engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111963305A true CN111963305A (en) | 2020-11-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010874765.3A Pending CN111963305A (en) | 2020-08-27 | 2020-08-27 | Six-stroke hybrid engine |
Country Status (1)
| Country | Link |
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| CN (1) | CN111963305A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305053A (en) * | 2000-12-05 | 2001-07-25 | 贾平安 | 6-stroke IC engine |
| CN102865135A (en) * | 2011-07-05 | 2013-01-09 | 陈明 | Main part device of six-stroke high-temperature gas combustion-supporting energy-saving micro-emission engine |
| CN108374719A (en) * | 2018-03-19 | 2018-08-07 | 李洋涛 | A kind of gas-oil hybrid engine |
-
2020
- 2020-08-27 CN CN202010874765.3A patent/CN111963305A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305053A (en) * | 2000-12-05 | 2001-07-25 | 贾平安 | 6-stroke IC engine |
| CN102865135A (en) * | 2011-07-05 | 2013-01-09 | 陈明 | Main part device of six-stroke high-temperature gas combustion-supporting energy-saving micro-emission engine |
| CN108374719A (en) * | 2018-03-19 | 2018-08-07 | 李洋涛 | A kind of gas-oil hybrid engine |
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Application publication date: 20201120 |