CN204175430U - A kind of free-piston engine - Google Patents
A kind of free-piston engine Download PDFInfo
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- CN204175430U CN204175430U CN201420603091.3U CN201420603091U CN204175430U CN 204175430 U CN204175430 U CN 204175430U CN 201420603091 U CN201420603091 U CN 201420603091U CN 204175430 U CN204175430 U CN 204175430U
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Abstract
The utility model provides a kind of free-piston engine, comprise cylinder body, compress energy storage device, pumping plant and piston assembly, also comprise the first proportional pressure control valve, proportional pressure-reducing valve, proportional velocity regulating valve and pressure transducer, the piston cavity in described cylinder body is divided into burning cavity, air-inlet cavity, counter balance pocket, pump chamber and compression chamber by described piston assembly.Proportional pressure-reducing valve is provided with owing to starting on pipeline that hydraulic fluid port two entrances are connected with compress energy storage device with the main hydraulic fluid port of the compression of compression chamber and compressing, proportional velocity regulating valve, selector valve, proportional pressure control valve and pressure transducer, the testing signal of the pressure transducer that such basis is connected with compress energy storage device, selector valve is switched between compress energy storage device and fuel feeding accumulator, thus utilize a hydraulic power unit to complete repairing work to high low pressure two oil circuits, and the hydraulic oil in compress energy storage device can obtain a stable pressure feed to compression chamber after proportional pressure-reducing valve, make the pressure stability of compression chamber entrance.
Description
Technical field
The utility model relates to a kind of motor, the free-piston engine that especially a kind of compression chamber inlet pressure is stable.
Background technique
Along with the development of global economy, consumption for the energy aggravates, and the environmental problem brought thus is also outstanding day by day, energy saving standard becomes two large problems of current global concern, hydraulic free-piston engine has variable compression ratio can realize again flexible layout simultaneously, thus can fuel economy be improved and reduce exhaust emission, be the star of running mechanism power likely.
Current hydraulic free-piston engine still rests on laboratory prototype experimental stage, and have many key technologies and a difficult problem to need to solve, the accurate control wherein for compression ratio is more of paramount importance.For single-piston hydraulic free-piston engine, mainly contain the stress level of compress energy storage device, the stress level of load accumulator and the oil injection time of diesel engine to the impact of its compression ratio, wherein the stress level of compress energy storage device plays a part main.The hydraulic oil that current compress energy storage device exports to compression chamber, it is generally the mode adopting compress energy storage device to be directly connected with compression chamber, due to the motion of piston assembly, the volume of compression chamber increases gradually, therefore compress energy storage device needs constantly to compression chamber fuel feeding, therefore cause the pressure of compress energy storage device to reduce, thus flow into the pressure also corresponding reduction of the hydraulic oil of compression chamber; Although in expansion stroke subsequently, hydraulic oil in compression chamber flow back into again in compress energy storage device, but due to the loss such as leakage of centre, pressure in compress energy storage device is reduced gradually, and can not ensure that the pressure of each circulation is equal, therefore make the compression process of motor all change in each circulation.
Model utility content
The purpose of this utility model is to provide a kind of compression chamber inlet pressure to stablize and the adjustable free-piston engine of flow.
To achieve these goals, the utility model adopts following technological scheme:
A kind of free-piston engine, comprise cylinder body, compress energy storage device, pumping plant and the piston assembly be arranged in described cylinder body, also comprise the first proportional pressure control valve, proportional pressure-reducing valve, proportional velocity regulating valve and pressure transducer, piston cavity in described cylinder body is divided into the burning cavity that the length direction along described piston assembly is arranged in order by described piston assembly, air-inlet cavity, counter balance pocket, pump chamber and compression chamber, described compression chamber is provided with and starts hydraulic fluid port with the main hydraulic fluid port of the compression of ft connection with compressing, described compress energy storage device respectively with the entrance of described first proportional pressure control valve, the entrance of described proportional pressure-reducing valve, the outlet of described proportional velocity regulating valve and the test port of described pressure transducer are connected,
Connecting tube between described first proportional pressure control valve with described compress energy storage device is connected by the outlet of the first selector valve with described pumping plant;
The outlet of described proportional pressure-reducing valve starts hydraulic fluid port with the entrance of described proportional velocity regulating valve, the main hydraulic fluid port of described compression and described compression respectively and is connected, described proportional pressure-reducing valve and described compression start and the connecting tube between hydraulic fluid port have been arranged in parallel the second selector valve and have compressed one-way valve, and the entrance of described compression one-way valve starts hydraulic fluid port be connected with described compression.
Improve as one of the present utility model, free-piston engine of the present utility model also comprises the second proportional pressure control valve, and the entrance of described second proportional pressure control valve is connected on the connecting tube between described first selector valve and described pumping plant.
Improve as one of the present utility model, described compression chamber is also provided with the compression repairing mouth with ft connection, and described compression repairing mouth is connected with fuel feeding accumulator, is also provided with hydraulic control and replys one-way valve between described fuel feeding accumulator and described compression repairing mouth;
Described pump chamber is provided with and the pump chamber oil drain out of ft connection and pump chamber repairing mouth, described pump chamber oil drain out is connected with pump oil one-way valve, described pump oil one-way valve is connected with load accumulator, described load accumulator is communicated with described counter balance pocket simultaneously, described pump chamber repairing mouth is connected with described fuel feeding accumulator, and being also provided with hydraulic control oil sucting one-way valve between described fuel feeding accumulator and described pump chamber repairing mouth, described fuel feeding accumulator and described hydraulic control oil sucting one-way valve or described hydraulic control are replied on pipeline that one-way valve is connected and are parallel with direct-acting overflow valve.
Improve as one of the present utility model, free-piston engine of the present utility model also comprises oil circuit control, and the control end that described oil circuit control replys one-way valve with described hydraulic control oil sucting one-way valve and described hydraulic control is respectively connected.
Preferred as one of the present utility model, described first selector valve is two position three way directional control valve, and described second selector valve is bi-bit bi-pass selector valve.
Preferred as one of the present utility model, described burning cavity is provided with relief opening, and described air-inlet cavity is provided with suction port, is provided with scavenge trunk between described burning cavity and described air-inlet cavity.
Adopt technique scheme, the utility model has following beneficial effect:
Proportional pressure-reducing valve is provided with owing to starting on pipeline that hydraulic fluid port two entrances are connected with compress energy storage device with the main hydraulic fluid port of the compression of compression chamber and compressing, proportional velocity regulating valve, selector valve, proportional pressure control valve and pressure transducer, the testing signal of the pressure transducer that such basis is connected with compress energy storage device, selector valve is switched between compress energy storage device and fuel feeding accumulator, thus utilize a hydraulic power unit to complete repairing work to high low pressure two oil circuits, and the hydraulic oil in compress energy storage device can obtain a stable pressure feed to compression chamber after proportional pressure-reducing valve, thus make the pressure stability of compression chamber entrance.
Meanwhile, the proportional pressure control valve being connected in parallel on the outlet of compress energy storage device is used for ensureing the Maximum operating pressure of compress energy storage device.When operating load changes, only need the control electric current of corresponding adjustment proportional pressure-reducing valve and proportional pressure control valve, thus make compression chamber entrance obtain a suitable pressure, and still can keep the stable of inlet pressure.When motor carries out expansion work, piston assembly moves to lower dead center, provides high pressure oil by pump oil one-way valve to load and load accumulator; High pressure oil now in compression chamber the startup hydraulic fluid port offered of compressed chamber and main hydraulic fluid port again under the promotion of piston assembly, flow back in compress energy storage device through proportional velocity regulating valve.When needed for load, flow is less, except by reducing except the motion frequency of piston assembly, by the movement velocity regulating the openings of sizes of proportional velocity regulating valve to adjust piston assembly, thus can reaching the object of adjustment output flow in real time.
In addition, when piston assembly runs to position a certain close to lower dead center, now reduce the input current of proportional velocity regulating valve, the rapid movement of piston is inhibited, in compression chamber, form buffering, prevent the collision of piston assembly and cylinder body.
accompanying drawing explanation
Fig. 1 is the anatomical connectivity schematic diagram of the utility model free-piston engine.
Indicate corresponding as follows in figure:
1-cylinder body; 2-piston assembly;
3-compress energy storage device; 4-pumping plant;
5-first proportional pressure control valve; 6-proportional pressure-reducing valve;
7-proportional velocity regulating valve; 8-pressure transducer;
9-burning cavity; 10-air-inlet cavity;
11-counter balance pocket; 12-pump chamber;
13-compression chamber; 14-oil sprayer;
15-relief opening; 16-suction port;
17-inlet piston; 18-Sealing;
19-scavenge trunk; 20-compresses main hydraulic fluid port;
21-compression starts hydraulic fluid port; 22-compresses repairing mouth;
23-first selector valve; 24-second selector valve;
25-compresses one-way valve; 26-second proportional pressure control valve;
27-fuel feeding accumulator; One-way valve is replied in 28-hydraulic control;
29-oil circuit control; 30-pump chamber oil drain out;
31-pump chamber repairing mouth; 32-pump oil one-way valve;
33-load accumulator; 34-hydraulic control oil sucting one-way valve;
35-direct-acting overflow valve.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
As shown in Figure 1, the free-piston engine that the present embodiment provides, comprises cylinder body 1, piston assembly 2, compress energy storage device 3 and pumping plant 4, also comprises the first proportional pressure control valve 5, proportional pressure-reducing valve 6, proportional velocity regulating valve 7 and pressure transducer 8.Certainly, the free-piston engine of the present embodiment also needs control system, control system adopts the control system that existing free-piston engine adopts in the present embodiment, the Placement of the elements such as itself and the first proportional pressure control valve 5, proportional pressure-reducing valve 6, proportional velocity regulating valve 7 and pressure transducer 8 and each original paper mentioned below is all conventional Placement, all no longer describes in detail herein and hereafter.
Piston assembly 2 is arranged in the piston cavity of cylinder body 1, and the piston cavity in cylinder body 1 is divided into burning cavity 9, air-inlet cavity 10, counter balance pocket 11, pump chamber 12 and compression chamber 13 that the length direction along piston assembly 2 is arranged in order.Piston assembly 2 can be conventional fit system with coordinating of cylinder body 1, and burning cavity 9, air-inlet cavity 10, counter balance pocket 11 and pump chamber 12 also can adopt Placement of the prior art with the Placement of each pipeline of free-piston engine or adopt novel Placement.
In the present embodiment, burning cavity 9 is provided with relief opening 15 and oil sprayer 14, relief opening 15 is arranged on the position near piston assembly 2, oil sprayer 14 is arranged on the side corresponding with piston assembly 2, such piston assembly 2 can block relief opening 15 in the process in compression and combustion chamber 9, but can not affect oil sprayer 14 and work.Air-inlet cavity 10 is provided with suction port 16, and suction port 16 place is provided with the inlet piston 17 for controlling air inflow.The position of piston assembly 2 between burning cavity 9 and air-inlet cavity 10 is provided with Sealing 18, burning cavity 9 can be flowed in order to make the gas in air-inlet cavity 10 to mix with combustion oil, cylinder body 1 is also provided with the scavenge trunk 19 being communicated with burning cavity 9 and air-inlet cavity 10, and the mouth position that burning cavity 9 is communicated with is best and relief opening 15 is corresponding in scavenge trunk 19.
Compression chamber 13 is provided with the compression of ft connection main hydraulic fluid port 20, compress and start hydraulic fluid port 21 and compress repairing mouth 22, compress the position that main hydraulic fluid port 20 is positioned at close piston assembly 2, compression startup hydraulic fluid port 21 is positioned at the position away from piston assembly 2, the main hydraulic fluid port 20 of compression can be blocked by such piston assembly 2 in movement process, but compression can not be started hydraulic fluid port 21 blocks.
The interface of compress energy storage device 3 is divided into four tunnels, is connected respectively with the test port of the entrance of the first proportional pressure control valve 5, the entrance of proportional pressure-reducing valve 6, the outlet of proportional velocity regulating valve 7 and pressure transducer 8.
First proportional pressure control valve 5 is connected with the outlet of pumping plant 4 by the first selector valve 23 with the connecting tube between compress energy storage device 3, and the first selector valve 23 is preferably two position three way directional control valve.The outlet of the first proportional pressure control valve 5 is connected with oil cylinder.
In the present embodiment, the entrance connecting tube between the first selector valve 23 and pumping plant 4 being also parallel with the second proportional pressure control valve 26, second proportional pressure control valve 26 is connected on the connecting tube between the first selector valve 23 and pumping plant 4, and outlet is connected with oil cylinder.
The outlet of proportional pressure-reducing valve 6 is divided into four tunnels, and wherein a road is connected with the entrance of proportional velocity regulating valve 7, a road is connected with the main hydraulic fluid port 20 of compression, and remaining two-way starts hydraulic fluid port 21 and is connected with compressing.Proportional pressure-reducing valve 6 and the compression two-way connecting tube started between hydraulic fluid port 21 are arranged in parallel, wherein a road pipeline is provided with the second selector valve 24, second selector valve 24 is preferably bi-bit bi-pass selector valve, another road pipeline is provided with compression one-way valve 25, the entrance of compression one-way valve 25 starts hydraulic fluid port 21 with compression and is connected.
The compression repairing mouth 22 of compression chamber 13 is connected with fuel feeding accumulator 27, also be provided with hydraulic control between fuel feeding accumulator 27 and compression repairing mouth 22 and reply one-way valve 28, the control end that one-way valve 28 is replied in hydraulic control is connected with oil circuit control 29, and the entrance that one-way valve 28 is replied in hydraulic control is connected with fuel feeding accumulator 27, exports and be connected with compression repairing mouth 22.It is conventional Pilot operated check valves that one-way valve 28 is replied in hydraulic control in the present embodiment, and when oil circuit control 29 does not provide pressure oil, this Pilot operated check valve normally works, and when oil circuit control 29 provides pressure oil, the fluid flowing through this Pilot operated check valve can reverse flow.
Pump chamber 12 is provided with and the pump chamber oil drain out 30 of ft connection and pump chamber repairing mouth 31, pump chamber oil drain out 30 is connected with pump oil one-way valve 32, pump oil one-way valve 32 is connected with load accumulator 33, the concrete Placement of pump oil one-way valve 32 is connected with pump chamber oil drain out 30 for this one-way valve inlet, and outlet is connected with load accumulator 33.Load accumulator 33 is communicated with counter balance pocket 11 simultaneously.
Pump chamber repairing mouth 31 is also connected with fuel feeding accumulator 27, and be provided with hydraulic control oil sucting one-way valve 34 between fuel feeding accumulator 27 and pump chamber repairing mouth 31, the entrance of hydraulic control oil sucting one-way valve 34 is connected with fuel feeding accumulator 27, and outlet is connected with pump chamber repairing mouth 31, and control end is connected with oil circuit control 29.Hydraulic control oil sucting one-way valve 34 in the present embodiment is also conventional Pilot operated check valve, and when oil circuit control 29 does not provide pressure oil, this Pilot operated check valve normally works, and when oil circuit control 29 provides pressure oil, the fluid flowing through this Pilot operated check valve can reverse flow.
Fuel feeding accumulator 27 and hydraulic control oil sucting one-way valve 34 or hydraulic control are replied on pipeline that one-way valve 28 is connected and are parallel with direct-acting overflow valve 35, and the entrance of direct-acting overflow valve 35 is connected with corresponding pipeline, and outlet is connected with oil cylinder.
In the present embodiment, load is connected between fuel feeding accumulator 27 and load accumulator 33, and the pipeline between load with fuel feeding accumulator 27 is also connected with pumping plant 4 by the first selector valve 23.
Be described further according to the use of working procedure to the free-piston engine of the present embodiment of free-piston engine six different phases of the present embodiment below.
(1) preparatory stage:
When free-piston engine preparatory work, first pumping plant 4 is started, first selector valve 23 is communicated with pumping plant 4 and compress energy storage device 3, because the first selector valve 23 is two position three way directional control valve in the present embodiment, now this bi-bit bi-pass selector valve right position work as shown in Figure 1, compress energy storage device 3 fuel feeding given by pumping plant 4, regulates the control electric current of the first proportional pressure control valve 5 simultaneously, makes the pressure of compress energy storage device 3 reach the pressure required for normally working, after the pressure of compress energy storage device 3 reaches requirement, pressure transducer 8 sends signal to control system, control system controls the first selector valve 23 and disconnects the connection of pumping plant 4 and compress energy storage device 3 and be communicated with pumping plant 4 and the pipeline between load and fuel feeding accumulator 27, namely now two position three way directional control valve carries out commutation action and works in left position as shown in Figure 1, fuel feeding accumulator 27 fuel feeding given by pumping plant 4, set the required force value of fuel feeding accumulator 27 by direct-acting overflow valve 35 simultaneously, now, control system preferably controls the control electric current of the second proportional pressure control valve 26, make the oil pressure relief of the second proportional pressure control valve 26 a little more than the force value set by direct-acting overflow valve 35, to reduce the power loss of pumping plant 4.
(2) compression process constant pressure exports the stage:
After preparatory stage completes, compress energy storage device 3 and fuel feeding accumulator 27 all reach the force value of setting, now control system sends control signal, make the second selector valve 24 be communicated with proportional pressure-reducing valve 6 and start hydraulic fluid port 21 with compression, because the second selector valve 24 is bi-bit bi-pass selector valve in the present embodiment, now this bi-bit bi-pass selector valve right position work; Control system is according to the working condition of present load simultaneously, determine the stress level required for compressing, calculate and be supplied to proportional pressure-reducing valve 6 and the suitable control electric current of the first proportional pressure control valve 5, the pressure stability that proportional pressure-reducing valve 6 is exported and meet loaded work piece needs; In addition, the force value that the first proportional pressure control valve 5 sets is preferably a little more than about the setup pressure value 2MPa of proportional pressure-reducing valve 6, and to ensure the normal work of proportional pressure-reducing valve 6, concrete force value can set according to actual needs.
In the process, the high pressure oil in compress energy storage device 3 enters compression chamber 13 through proportional pressure-reducing valve 6 and the compressed startup hydraulic fluid port 21 of the second selector valve 24, and then promotion piston assembly 2 moves to burning cavity 9 direction; After piston assembly 2 moves to and opened by main for the compression on compression chamber 13 cavity hydraulic fluid port 20, the hydraulic oil that proportional pressure-reducing valve 6 flows out can be passed through compression and starts hydraulic fluid port 21 and main hydraulic fluid port 20 two passes of compression flows in compression chamber 13.
Because proportional pressure-reducing valve 6 is when normally working, its outlet pressure remains unchanged substantially, therefore the inlet pressure of compression chamber 13 remains unchanged substantially, the motion of piston assembly 2 is carried out at constant pressure, although the pressure now in compress energy storage device 3 reduces gradually due to continuously outflowing of high pressure oil, but due to the effect of proportional pressure-reducing valve 6, the ingress of compression chamber 13 can obtain basicly stable pressure all the time, like this, the compression process of piston assembly 2 just has very strong repeatability, also relatively becomes easy to the control of compression.
In the process that piston assembly 2 moves to burning cavity 9 direction, pump chamber 12 draws low pressure oil by hydraulic control oil sucting one-way valve 34 from fuel feeding accumulator 27, now oil circuit control 29 does not reply one-way valve 28 fuel feeding, the work of hydraulic control oil sucting one-way valve 34 forward to hydraulic control oil sucting one-way valve 34 and hydraulic control; The hydraulic control be simultaneously connected with compression chamber 13 reply one-way valve 28 due to compression chamber 13 pressure far above fuel feeding accumulator 27 pressure and keep closed condition.
In compression stroke, the piston assembly 2 first gas promoted in air-inlet cavity 10 enters burning cavity 9 through scavenge trunk 19, and the gas of combustion in burning cavity 9 is discharged by relief opening 15; Piston assembly 2 continues motion afterwards, after relief opening 15 is blocked by piston assembly 2, free-piston engine enters actual compression process, air in burning cavity 9 is compressed, no matter how the pressure that the outstanding advantages of this compression process is exactly compress energy storage device 3 changes, as long as ensure that the control electric current of proportional pressure-reducing valve 6 is constant, then compress the pressure all-the-time stable of main hydraulic fluid port 20 and compression startup hydraulic fluid port 21, thus guarantee that compression process is carried out at constant pressure.
(3) expansion stroke and the output power adjustable stage:
After piston assembly 2 moves to limit position to burning cavity 9 direction, this position is the top dead center position of piston assembly 2, same, and after piston assembly 2 is toward contrary reversing motion to limit position, this position is the bottom dead center position of piston assembly 2.
After piston assembly 2 moves to top dead center position, oil sprayer 14 sprays into appropriate fuel oil in burning cavity 9, oil inflame produces heat promotion piston assembly and moves to compression chamber 13 direction, now, hydraulic oil in pump chamber 12 flow in load accumulator 33 and load through pump oil one-way valve 32 under the promotion of piston assembly 2, and some flow in counter balance pocket 11; Hydraulic oil now in compression chamber 13 starts hydraulic fluid port 21 through the main hydraulic fluid port 20 of overcompression and compression equally and flows out under the effect of piston assembly 2, the oil return that compression starts oil 21 is flowed back in compress energy storage device 3 through overcompression one-way valve 25 and proportional velocity regulating valve 7, and the oil return of flowing out from the main hydraulic fluid port 20 of compression is flowed back to compress energy storage device 3 through proportional velocity regulating valve 7 equally.
When free-piston engine load needed for flow larger time, under control of the control system, the control electric current also corresponding increase of proportional velocity regulating valve 7, makes the through-current capability of proportional velocity regulating valve 7 strengthen, and reduces the resistance to motion of piston assembly 2; When free-piston engine load needed for flow minimum time; the control electric current of proportional velocity regulating valve 7 is reduced by control system; its through-current capability is reduced; reduce the movement velocity of piston assembly 2; thus the output flow of free-piston engine is reduced; can the traffic demand of proof load, be unlikely to again to make free-piston engine be in outage state for a long time.
It should be noted that, when free-piston engine load needed for flow minimum time, also can stop by making piston assembly 2 adjustment realizing free-piston engine output flow for a long time in lower dead center, but when piston assembly 2 waiting time is longer, free-piston engine is in long outage state, restart each time and be all similar to a Cold Start, although also its combustion position can be made to be in the optimum state by the alterable compression ratio of self, but make free-piston engine be in a kind of stable working state more to discharge with reducing by fuel saving, therefore do not advise adopting the output flow regulating free-piston engine in this way.
In addition, by reducing the control electric current of proportional velocity regulating valve 7, the movement velocity of piston assembly 2 being reduced, piston assembly 2 also can be avoided to produce with larger speed and cylinder body 1 and collide, cause damage and the damage of component.
(4) " scarce fire " recovery stage:
When there is " lacking fire " fault due to the impact of various enchancement factor in free-piston engine, it is made to rework, piston assembly 2 must be made to get back to bottom dead center position from residing position, this process is referred to as Recovery Process, position when " scarce fire " fault occurs residing for piston assembly 2 is also random, can be arbitrary position.
Now oil circuit control 29 replys one-way valve 28 fuel feeding to hydraulic control oil sucting one-way valve 34 and hydraulic control, hydraulic control oil sucting one-way valve 34 and hydraulic control is made to reply one-way valve 28 reverse-conducting, now compression chamber 13 communicates with the low pressure oil way of pump chamber 12 with fuel feeding accumulator 27, and counter balance pocket 11 communicates with the high-pressure oil passage of load accumulator 33, and then make piston assembly 2 get back to bottom dead center position under the effect of pressure difference, prepare next work cycle.
(5) the repairing stage:
Because leakage and hydraulic oil can produce restriction loss after reduction valve, although the hydraulic oil of compression chamber 13 can come back in compress energy storage device 3 in expansion stroke, but along with the to-and-fro motion of piston assembly 2, pressure in compress energy storage device 3 can reduce gradually, until lower than the pressure minimum preset time, control system can according to the output signal of pressure transducer 8, send a signal to the first selector valve 23, it is made to be communicated with pumping plant 4 and compress energy storage device 3, namely as the two position three way directional control valve right position work of the first selector valve 23, to compress energy storage device 3 fuel feeding, until pressure reaches the force value of setting, then controller sends a signal to the first selector valve 23 again, makes its left position work, is communicated with pumping plant 4 and fuel feeding accumulator 27, to fuel feeding accumulator 27 fuel feeding, in this process by direct-acting overflow valve 35 overflow.In the whole repairing stage, due to compression chamber 13 always passing ratio reduction valve 6 be connected with compress energy storage device 3, the impact of the therefore pressure of the compression chamber 13 not pressure surge of accumulator 3 by compression, still keeps stable.
(6) the pressure adjusting stage:
When the operating conditions of free-piston engine changes, need the compression ratio adjusting free-piston engine, to play the advantage of free-piston engine to greatest extent, now need to adjust the promotion pressure of compression chamber 13.Concrete adjustment mode is, the compression ratio size of control system required for load calculates required pressure size, and according to proportional pressure-reducing valve 6 and the pressure of the second proportional pressure control valve 5 and the corresponding relation of electric current, export the corresponding electric current that controls respectively to proportional pressure-reducing valve 6 and the second proportional pressure control valve 5, make its pressure reach setting value, thus set up the pressure of inflow compression chamber 13 easily and made it keep stable.
By reference to the accompanying drawings detailed description is done to the utility model above; but mode of execution of the present utility model is not limited in above-mentioned mode of execution; those skilled in the art can make various distortion to the utility model according to prior art; as the direct-acting overflow valve 35 in above-described embodiment is changed to proportional pressure control valve etc., these all belong to protection domain of the present utility model.
Claims (6)
1. a free-piston engine, comprise cylinder body, compress energy storage device, pumping plant and the piston assembly be arranged in described cylinder body, it is characterized in that, also comprise the first proportional pressure control valve, proportional pressure-reducing valve, proportional velocity regulating valve and pressure transducer, piston cavity in described cylinder body is divided into the burning cavity that the length direction along described piston assembly is arranged in order by described piston assembly, air-inlet cavity, counter balance pocket, pump chamber and compression chamber, described compression chamber is provided with and starts hydraulic fluid port with the main hydraulic fluid port of the compression of ft connection with compressing, described compress energy storage device respectively with the entrance of described first proportional pressure control valve, the entrance of described proportional pressure-reducing valve, the outlet of described proportional velocity regulating valve and the test port of described pressure transducer are connected,
Connecting tube between described first proportional pressure control valve with described compress energy storage device is connected by the outlet of the first selector valve with described pumping plant;
The outlet of described proportional pressure-reducing valve starts hydraulic fluid port with the entrance of described proportional velocity regulating valve, the main hydraulic fluid port of described compression and described compression respectively and is connected, described proportional pressure-reducing valve and described compression start and the connecting tube between hydraulic fluid port have been arranged in parallel the second selector valve and have compressed one-way valve, and the entrance of described compression one-way valve starts hydraulic fluid port be connected with described compression.
2. free-piston engine as claimed in claim 1, it is characterized in that, also comprise the second proportional pressure control valve, the entrance of described second proportional pressure control valve is connected on the connecting tube between described first selector valve and described pumping plant.
3. free-piston engine as claimed in claim 2, it is characterized in that, described compression chamber is also provided with the compression repairing mouth with ft connection, and described compression repairing mouth is connected with fuel feeding accumulator, is also provided with hydraulic control and replys one-way valve between described fuel feeding accumulator and described compression repairing mouth;
Described pump chamber is provided with and the pump chamber oil drain out of ft connection and pump chamber repairing mouth, described pump chamber oil drain out is connected with pump oil one-way valve, described pump oil one-way valve is connected with load accumulator, described load accumulator is communicated with described counter balance pocket simultaneously, described pump chamber repairing mouth is connected with described fuel feeding accumulator, and being also provided with hydraulic control oil sucting one-way valve between described fuel feeding accumulator and described pump chamber repairing mouth, described fuel feeding accumulator and described hydraulic control oil sucting one-way valve or described hydraulic control are replied on pipeline that one-way valve is connected and are parallel with direct-acting overflow valve.
4. the free-piston engine as described in claim arbitrary in claim 1-3, is characterized in that, also comprise oil circuit control, and the control end that described oil circuit control replys one-way valve with described hydraulic control oil sucting one-way valve and described hydraulic control is respectively connected.
5. the free-piston engine as described in claim arbitrary in claim 1-3, is characterized in that, described first selector valve is two position three way directional control valve, and described second selector valve is bi-bit bi-pass selector valve.
6. the free-piston engine as described in claim arbitrary in claim 1-3, it is characterized in that, described burning cavity is provided with relief opening, described air-inlet cavity is provided with suction port, is provided with scavenge trunk between described burning cavity and described air-inlet cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420603091.3U CN204175430U (en) | 2014-10-17 | 2014-10-17 | A kind of free-piston engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420603091.3U CN204175430U (en) | 2014-10-17 | 2014-10-17 | A kind of free-piston engine |
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| CN204175430U true CN204175430U (en) | 2015-02-25 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104329164A (en) * | 2014-10-17 | 2015-02-04 | 华侨大学 | Free piston engine |
| CN104929765A (en) * | 2015-07-03 | 2015-09-23 | 北京理工大学 | Stepless speed regulating single-piston type hydraulic free piston engine |
| CN106762863A (en) * | 2016-12-16 | 2017-05-31 | 中国科学院理化技术研究所 | A kind of fruit juice high pressure sterilization device |
| CN112004593A (en) * | 2018-03-29 | 2020-11-27 | Prc-迪索托国际公司 | Adhesive and sealant mixer with automatic stroke length adjustment |
-
2014
- 2014-10-17 CN CN201420603091.3U patent/CN204175430U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104329164A (en) * | 2014-10-17 | 2015-02-04 | 华侨大学 | Free piston engine |
| CN104929765A (en) * | 2015-07-03 | 2015-09-23 | 北京理工大学 | Stepless speed regulating single-piston type hydraulic free piston engine |
| CN106762863A (en) * | 2016-12-16 | 2017-05-31 | 中国科学院理化技术研究所 | A kind of fruit juice high pressure sterilization device |
| CN112004593A (en) * | 2018-03-29 | 2020-11-27 | Prc-迪索托国际公司 | Adhesive and sealant mixer with automatic stroke length adjustment |
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