CN107842395A - A kind of two-stage piston expansion engine - Google Patents
A kind of two-stage piston expansion engine Download PDFInfo
- Publication number
- CN107842395A CN107842395A CN201711003682.1A CN201711003682A CN107842395A CN 107842395 A CN107842395 A CN 107842395A CN 201711003682 A CN201711003682 A CN 201711003682A CN 107842395 A CN107842395 A CN 107842395A
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- CN
- China
- Prior art keywords
- levels
- expansion
- level
- piston
- cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B1/00—Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements
- F01B1/02—Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements with cylinders all in one line
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B25/00—Regulating, controlling, or safety means
- F01B25/02—Regulating or controlling by varying working-fluid admission or exhaust, e.g. by varying pressure or quantity
- F01B25/08—Final actuators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B25/00—Regulating, controlling, or safety means
- F01B25/02—Regulating or controlling by varying working-fluid admission or exhaust, e.g. by varying pressure or quantity
- F01B25/08—Final actuators
- F01B25/10—Arrangements or adaptations of working-fluid admission or discharge valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B9/00—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups
- F01B9/02—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups with crankshaft
Abstract
The invention provides a kind of two-stage piston expansion engine, including：I level expansion mechanisms, II level expansion mechanisms, bent axle and pipeline, connected by the pipeline between I levels expansion mechanism and II the level expansion mechanism；Described I levels expansion mechanism includes I level intake valves, I level air bleeding valves, I level pistons, I levels expansion cylinder and I level connecting rods；Described II levels expansion mechanism includes II level expansion cylinders, II level air bleeding valves, II levels piston and II level connecting rods；Check valve is provided with the pipeline, the import of the pipeline is connected to the bottom of the I levels expansion cylinder, and the outlet of the pipeline is connected to the top of the II levels expansion cylinder, and the other end of the I levels connecting rod and II level connecting rods is both connected on the bent axle.When the present invention solves the ratio between admission pressure and environmental pressure by double expansion mechanism and exceedes single stage piston formula expansion ratio, pressure at expulsion is excessive, the problem of big is lost in incomplete expansion, improves the power output and energy utilization efficiency of piston expansion engine.
Description
Technical field
The present invention relates to expanding machine technical field, more particularly to a kind of two-stage piston expansion engine.
Background technology
Cause that the current environmental pollution in China is serious, energy supply imbalance between supply and demand constantly aggravates the characteristics of China's energy-consuming,
The serious sustainable development for constraining China's economy.Under current shape, the work for reducing energy consumption and improvement environment is imperative.
UTILIZATION OF VESIDUAL HEAT IN is to improve the important means of energy utilization rate.Industrial exhaust heat be widely present in weaving, steel, non-ferrous metal, building materials,
In the production process of the industries such as chemical industry, coal, electric power, oil, petrochemical industry, its residual heat resources account for fuel consumption total amount 15%~
67%, most of recoverable, but China's industrial waste heat resource rate of recovery is only generally 30% or so at present, and UTILIZATION OF VESIDUAL HEAT IN is dived
Power is huge.In heat recovery field, organic Rankine bottoming cycle is as a kind of new hot merit for reclaiming low grade residual heat resource
Switch technology, replace traditional working-medium water to carry out Rankine cycle with lower boiling organic working medium and realize that energy converts, can realize pair
Middle low-temperature heat source (conversion of waste heat, is a kind of effective means for improving efficiency of energy utilization.Based on organic Rankine bottoming cycle
Heat to power output technology has very extensive adaptability, available for geothermal generating, Solar use, recovery industrial exhaust heat
Deng.
Piston expansion engine is a kind of specific structure type applied to organic Rankine bottoming cycle expanding machine, due to its pressure ratio
It is high, manufacturing process is ripe, is applicable different operating modes, full stream expansion can be used for and by extensive concern.But current piston expansion engine
Efficiency is low, influences its extensive use, it is therefore necessary to which expanding machine is correspondingly improved.
The content of the invention
Therefore, the present invention propose it is a kind of the invention provides it is a kind of based on two-stroke internal-combustion engine exhaust gear two-stage work
Plug expanding machine mechanism, to improve the expansion ratio of expanding machine, reduce incomplete expansion loss, improve the economic performance of expanding machine.
The invention provides a kind of two-stage piston expansion engine, including：I level expansion mechanisms, II level expansion mechanisms, bent axle
And pipeline, connected by the pipeline between I levels expansion mechanism and II the level expansion mechanism；Described I level expansion mechanism bags
I level intake valves, I level air bleeding valves, I level pistons, I levels expansion cylinder and I level connecting rods are included, the I levels piston is telescopically connected to
In the I levels expansion cylinder, one end of the I levels connecting rod is connected to the bottom of the I levels piston；Described II level expansion mechanisms
Including II level expansion cylinders, II level air bleeding valves, II levels piston and II level connecting rods, the II levels piston is telescopically connected to described
In II level expansion cylinders, one end of the II levels connecting rod is connected to the bottom of the II levels piston；List is provided with the pipeline
To valve, the import of the pipeline is connected to the bottom of the I levels expansion cylinder, and it is swollen that the outlet of the pipeline is connected to the II levels
The top of flatulence cylinder, the other end of I levels connecting rod and II the level connecting rod are both connected on the bent axle.
Further, the bent axle has I levels projection, the bent axle and the II with the position that the I levels connecting rod is connected
The position of level connecting rod connection has II levels raised.
Further, angle is 180 degree between the raised and described II levels projection of the I levels.
Further, the raised height of the I levels is equal to the half of the stroke of the I levels piston.
Further, the raised height of the II levels is equal to the half of the stroke of the II levels piston.
Further, I levels intake valve and I the level air bleeding valve is both connected to the top of the I levels expansion cylinder, and with
External cam valve train is connected.
Further, the II levels air bleeding valve is connected to the top of the II levels expansion cylinder, and matches somebody with somebody with external cam
Mechanism of qi structure is connected.
In use, I level expansion mechanisms with reference to the exhaust gear of traditional two-stroke internal-combustion engine, the list between two-stage in pipeline
Effect to valve is the crankcase that the working medium for preventing from entering in II level expansion cylinders is flowed into I level expansion mechanisms.Specific two-stage is lived
The course of work of plug expanding machine is divided into following several stages：
I level cylinder intake processes：I level pistons are run at top dead centre, and I levels intake valve is opened, and gas passes through I level intake valves
Into I level expansion cylinders, promote descent of piston into the working medium in cylinder and do work, by toggle by the straight of piston
Line motion is converted to rotary motion output.When bent axle runs certain angle, I levels intake valve is closed, and completes I level cylinder intake mistakes
Journey.Now II levels cylinder exhaust valve is in open mode, and under the promotion of piston, the Working medium gas in II level cylinders is by II level gas
Cylinder air bleeding valve discharges expanding machine.
I level cylinder expansion processes：After intake process is completed, continue to expand against into the working medium in I level expansion cylinders
Piston does work, until I level pistons upper surface reaches the upper end of restriction.Now I levels air bleeding valve is still within open mode.
II level cylinder intake processes：After I level cylinders expansion process is completed, I level pistons stop under continuing traveling downwardly to I level pistons
Point and I levels piston are up on I level pistons during the upper end of section arrival restriction by restriction lower end, the expansion of I levels
Working medium in cylinder flows into II level expansion cylinders by check valve, continues expansion work in II level expansion cylinders and promotes the expansion of II levels
Piston is done work, and the linear motion of its piston is converted into rotary motion output by toggle.The I level air inlets of this process
Valve, exhaust valve closure, II level exhaust valve closures.
I level cylinder exhaust processes：After II level cylinder intake processes, I levels piston continues up until reaching top dead centre,
Now I levels air bleeding valve is opened, and the gas in I level expansion cylinders is swollen by the remaining working medium discharge in cylinder under the promotion of I level pistons
Outside swollen machine.Now II levels piston is continued traveling downwardly under the promotion into working medium in II level cylinders until reaching II level expansion cylinders
Lower dead center, and then complete a cyclic process.
Beneficial effects of the present invention：The present invention solves the ratio between admission pressure and environmental pressure by double expansion mechanism and surpassed
The problem of when crossing single stage piston formula expansion ratio, pressure at expulsion is excessive, incomplete expansion loss is big, improves piston expansion engine
Power output and energy utilization efficiency.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
Fig. 1 is a kind of structural representation of two-stage piston expansion engine of the embodiment of the present invention；
Fig. 2 a are a kind of I level cylinder intake process operating conditions figures of two-stage piston expansion engine of the embodiment of the present invention；
Fig. 2 b are a kind of I level cylinder expansion process working state figures of two-stage piston expansion engine of the embodiment of the present invention；
Fig. 2 c are a kind of II level cylinder intake process operating conditions figures of two-stage piston expansion engine of the embodiment of the present invention；
Fig. 2 d are a kind of I level cylinder exhaust process operating conditions figures of two-stage piston expansion engine of the embodiment of the present invention.
In figure：1st, I levels intake valve, 2, I level air bleeding valves, 3, I level pistons, 4, I level cylinders, 5, II level cylinders, 6, II levels row
Air valve, 7, II level pistons, 8, check valve, 9, I level connecting rods, 10, bent axle, 11, II level connecting rods.
Embodiment
Below in conjunction with the accompanying drawings, by the way that the embodiment of the present invention is described in detail, technical scheme will be made
And other beneficial effects are apparent.
With reference to figure 1, new two-stage piston expansion engine mechanism of the invention includes I levels intake valve 1, I levels air bleeding valve 2, I levels
Piston 3, I levels cylinder 4, II levels cylinder 5, II levels air bleeding valve 6, II levels piston 7, check valve 8, I levels connecting rod 9, bent axle 10 and II
Level connecting rod 11.Initial position work as shown in figure 1, now first stage piston 3 is in top dead center position.The course of work such as Fig. 2 a, 2b,
It is the four-stage of a course of work shown in 2c, 2d, wherein, A faces represent the upper surface of I levels piston 3, and B faces represent that I levels are lived
The lower surface of plug 3, C faces represent the upper end of restriction, and D faces represent the lower end of restriction, and arrow represents the traffic direction of piston.Such as
Shown in Fig. 2 a, bent axle 10 turns an angle in the case where starting motor driven, while drives cam valve train by transmission mechanism
Driving I levels intake valve 1 is opened, and the gas that certain pressure be present is entered 4 in I level cylinders by air inlet via I levels intake valve 1,
So as to drive I levels piston 3 descending, the downward movement of I levels piston 3 drives bent axle 10 to rotate by I levels connecting rod 9, and then drives II
Level piston 7 is up, and now cam valve train ensures that I levels air bleeding valve 2 is closed, and II levels air bleeding valve 6 is opened, in II levels cylinder 5
Gas discharges II levels cylinder 5 under the promotion of II levels piston 7 via II levels air bleeding valve 6.As shown in Figure 2 b, bent axle 10 turns to one
After determining angle, in the presence of cam valve train, I levels intake valve 1 is closed, and I levels air bleeding valve 2 is closed, and II levels air bleeding valve 6 is beaten
Open, continue expansion work into the gas in I levels cylinder 4, promote I levels piston 3 to continue traveling downwardly, pass through I levels connecting rod 9 and bent axle
10 are changed into rotation, while by bent axle 10 and II levels connecting rod 11 by the up fortune for being changed into II levels piston 7 of bent axle 10
Move and then continue to press on the gas in II levels cylinder 5, discharged by II levels air bleeding valve 6 outside II levels cylinder 5, until II levels piston 7
Reach top dead center position.As shown in Figure 2 c, the upper end C of restriction is reached to I level pistons when I levels piston 3 goes downwards to its upper surface A
3 are up to this section of moment of upper surface A in-positions C by lower dead center, and the gas in I levels cylinder 4 is by check valve 8 via two-stage gas
The connecting pipe of cylinder enters II levels cylinder 5, I levels intake valve 1, I levels air bleeding valve 2, and II levels air bleeding valve 6 enters all in closed mode
The gas push II levels piston 7 entered in II levels cylinder 5 is run downwards, externally acting, by bent axle 10 and II levels connecting rod 11 by II
The linear motion of level piston 7 is changed into rotation, and the rotation of bent axle 10 is turned the straight line for being changed into I levels piston 3 by connecting rod 9
Motion.As shown in Figure 2 d, I levels piston 3 continues its up upper surface and reaches its top dead center position by position C, in cam distribution
In the presence of mechanism, I levels intake valve 1 is closed, and I levels air bleeding valve 2 is opened, and II levels air bleeding valve 6 is closed, now residual in I levels cylinder 4
Residual air body discharges I levels cylinder 4 by I levels air bleeding valve 2, continues expansion work into the gas in II levels cylinder 5, until reaching just
Beginning position, complete a working cycles.The present invention solves the ratio between admission pressure and environmental pressure by double expansion mechanism and surpassed
The problem of when crossing single stage piston formula expansion ratio, pressure at expulsion is excessive, incomplete expansion loss is big, improves piston expansion engine
Power output and energy utilization efficiency.
The preferred embodiment of the present invention is the foregoing is only, is not intended to limit the invention, all spirit in the present invention
With all any modification, equivalent and improvement done within principle etc., it should be included in the scope of the protection.
Claims (7)
- A kind of 1. two-stage piston expansion engine, it is characterised in that including：I level expansion mechanisms, II level expansion mechanisms, bent axle and Pipeline, connected by the pipeline between I levels expansion mechanism and II the level expansion mechanism；Described I levels expansion mechanism includes I level intake valves, I level air bleeding valves, I level pistons, I levels expansion cylinder and I level connecting rods, institute State I levels piston to be telescopically connected in the I levels expansion cylinder, one end of the I levels connecting rod is connected to the I levels piston Bottom；Described II levels expansion mechanism includes II level expansion cylinders, II level air bleeding valves, II levels piston and II level connecting rods, the II Level piston is telescopically connected in the II levels expansion cylinder, and one end of the II levels connecting rod is connected to the II levels piston Bottom；Check valve is provided with the pipeline, the import of the pipeline is connected to the bottom of the I levels expansion cylinder, the pipeline Outlet be connected to the top of the II levels expansion cylinder, the other end of I levels connecting rod and II the level connecting rod is both connected to described On bent axle.
- 2. a kind of two-stage piston expansion engine as claimed in claim 1, it is characterised in that the bent axle and the I cascades The position of bar connection has I levels projection, and the bent axle has II levels raised with the position that the II levels connecting rod is connected.
- A kind of 3. two-stage piston expansion engine as claimed in claim 2, it is characterised in that the raised and described II of I levels Angle is 180 degree between level is raised.
- A kind of 4. two-stage piston expansion engine as claimed in claim 3, it is characterised in that raised height of the I levels etc. In the half of the stroke of the I levels piston.
- A kind of 5. two-stage piston expansion engine as claimed in claim 3, it is characterised in that raised height of the II levels etc. In the half of the stroke of the II levels piston.
- 6. a kind of two-stage piston expansion engine as claimed in claim 1, it is characterised in that the I levels intake valve and I levels row Air valve is both connected to the top of the I levels expansion cylinder, and is connected with external cam valve train.
- 7. a kind of two-stage piston expansion engine as claimed in claim 1, it is characterised in that the II levels air bleeding valve is connected to The top of the II levels expansion cylinder, and be connected with external cam valve train.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711003682.1A CN107842395B (en) | 2017-10-24 | 2017-10-24 | A kind of two-stage piston expansion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711003682.1A CN107842395B (en) | 2017-10-24 | 2017-10-24 | A kind of two-stage piston expansion engine |
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| Publication Number | Publication Date |
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| CN107842395A true CN107842395A (en) | 2018-03-27 |
| CN107842395B CN107842395B (en) | 2019-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711003682.1A Active CN107842395B (en) | 2017-10-24 | 2017-10-24 | A kind of two-stage piston expansion engine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108843401A (en) * | 2018-06-13 | 2018-11-20 | 中国科学院理化技术研究所 | A kind of reciprocating expansion engine structure |
| CN111706398A (en) * | 2020-07-31 | 2020-09-25 | 中南大学 | High-expansion-ratio horizontally-opposed piston type expansion machine and control method |
| CN113217110A (en) * | 2020-01-21 | 2021-08-06 | 机械科学研究院浙江分院有限公司 | Piston steam engine |
| CN113756874A (en) * | 2020-06-02 | 2021-12-07 | 机械科学研究院浙江分院有限公司 | Steam piston driven linear generator |
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| CN103452589A (en) * | 2013-08-22 | 2013-12-18 | 安徽农业大学 | Air distribution mechanism for two-stage type air power engine |
| DE102012021965A1 (en) * | 2012-11-08 | 2014-06-05 | Linde Aktiengesellschaft | Apparatus, useful for performing chemical, petrochemical or pharmaceutical reaction to produce acetylene, includes cylinder-piston arrangements, cylinder, inlet opening and inlet valve, and outlet opening or outlet valve |
| US20160160745A1 (en) * | 2013-03-15 | 2016-06-09 | Scuderi Group, Inc. | Split-cycle engines with direct injection |
| CN206035642U (en) * | 2016-08-31 | 2017-03-22 | 朱瑞俊 | Can realize engine of big expansion -pressure ratio |
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| CN101418716A (en) * | 2007-10-23 | 2009-04-29 | 赵元藩 | Highly effective integration heat engine |
| CN103097670A (en) * | 2010-07-29 | 2013-05-08 | 等熵有限公司 | Apparatus for compressing and expanding a gas |
| CN202810945U (en) * | 2012-10-09 | 2013-03-20 | 中国科学院工程热物理研究所 | Piston expansion engine system in single valve structure |
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| CN206035642U (en) * | 2016-08-31 | 2017-03-22 | 朱瑞俊 | Can realize engine of big expansion -pressure ratio |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108843401A (en) * | 2018-06-13 | 2018-11-20 | 中国科学院理化技术研究所 | A kind of reciprocating expansion engine structure |
| CN113217110A (en) * | 2020-01-21 | 2021-08-06 | 机械科学研究院浙江分院有限公司 | Piston steam engine |
| CN113756874A (en) * | 2020-06-02 | 2021-12-07 | 机械科学研究院浙江分院有限公司 | Steam piston driven linear generator |
| CN111706398A (en) * | 2020-07-31 | 2020-09-25 | 中南大学 | High-expansion-ratio horizontally-opposed piston type expansion machine and control method |
| CN111706398B (en) * | 2020-07-31 | 2024-04-09 | 中南大学 | High expansion ratio horizontal opposed piston type expander and control method |
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| CN107842395B (en) | 2019-08-13 |
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