阅读说明：本技术 一种基于热能向液压能直接转换的斯特林液压动力装置 (Stirling hydraulic power device based on direct conversion from heat energy to hydraulic energy ) 是由 田昊 赵盛富 陈圣涛 侯交义 于 2019-11-13 设计创作，主要内容包括：本发明提供一种热能向液压能直接转换的斯特林液压动力装置。本发明包括：由冷端和热端气缸,冷端和热端活塞,冷热源,回热器组成的自由活塞斯特林发动机以及与自由活塞斯特林发动机冷热端分别连接的活塞式液压缸,其中,动力部分采用自由活塞斯特林发动机,热端气体由热源加热,冷端气体经冷却。热端活塞把上方气体的膨胀功通过活塞杆传递给液压缸,推动液压缸活塞运动,排出高压油。回程时通过控制换向阀接通压力油实现活塞回弹,从而连续输出液压油。本发明通过电磁阀输入信号周期和相位的控制可以达到改变两活塞运动相位差的效果。让两输出端输出的液压油只受该边换向阀的控制,实现活塞输出解耦,可提高系统集成度。(The invention provides a Stirling hydraulic power device for directly converting heat energy into hydraulic energy. The invention comprises the following steps: the free piston Stirling engine comprises a free piston Stirling engine consisting of a cold end cylinder, a hot end cylinder, a cold end piston, a hot end piston, a cold source and a heat regenerator, and a piston type hydraulic cylinder which is respectively connected with the cold end and the hot end of the free piston Stirling engine, wherein the power part adopts the free piston Stirling engine, the hot end gas is heated by the heat source, and the cold end gas is cooled. The hot end piston transfers the expansion work of the gas above to the hydraulic cylinder through the piston rod, pushes the piston of the hydraulic cylinder to move, and discharges high-pressure oil. During return stroke, the reversing valve is controlled to be communicated with pressure oil to realize piston rebound, and therefore hydraulic oil is continuously output. The invention can achieve the effect of changing the motion phase difference of the two pistons by controlling the input signal period and the phase of the electromagnetic valve. The hydraulic oil output by the two output ends is controlled by the reversing valve at the side, so that the output decoupling of the piston is realized, and the system integration level can be improved.)

1. A stirling hydraulic power plant for direct conversion of thermal energy to hydraulic energy, comprising: a hot end Stirling piston cylinder, a cold end Stirling piston cylinder, a hot end Stirling piston and a cold end Stirling piston, the hot end Stirling piston cylinder and the cold end Stirling piston cylinder are communicated with each other through an air passage, the hot end Stirling piston is arranged in the hot end Stirling piston cylinder, the cold end Stirling piston is arranged in the cold end Stirling piston cylinder, the hot end Stirling piston and the cold end Stirling piston are respectively connected with a hydraulic cylinder piston in the double-acting hot end hydraulic cylinder and a cold end hydraulic cylinder piston in the double-acting cold end hydraulic cylinder through piston rods, the double-acting hot end hydraulic cylinder and the double-acting cold end hydraulic cylinder are respectively communicated through a first electromagnetic valve and a second electromagnetic valve, the movement phase difference of the hot-end Stirling piston and the cold-end Stirling piston is changed by controlling the period and the phase of input signals of the first electromagnetic valve and the second electromagnetic valve.

2. A stirling hydraulic power plant for converting thermal energy directly to hydraulic energy according to claim 1, further comprising a regenerator, a heater and a cooler, wherein the regenerator is arranged on a communication channel between the hot-end stirling piston cylinder and the cold-end stirling piston cylinder, the heater is arranged on the hot-end stirling piston cylinder side, and the cooler is arranged on the cold-end stirling piston cylinder side.

3. A stirling hydraulic power plant for converting thermal energy directly to hydraulic energy according to claim 1 or 2, wherein the first solenoid valve is a two-position three-way reversing valve and the second solenoid valve is a two-position four-way solenoid valve.

4. A stirling hydraulic power plant for converting thermal energy directly to hydraulic energy as in claim 3 wherein one path of the first solenoid valve is connected to the rodless chamber side of the double acting hot side hydraulic cylinder, the other two paths are connected to the high pressure oil source, the rod chamber of the double acting hot side hydraulic cylinder is connected to the outside air, two paths of the second solenoid valve are connected to the rodless chamber side and the rod chamber side of the double acting cold side hydraulic cylinder, and one path is connected to the oil tank.

Technical Field

The invention relates to the technical field of new energy drive hydraulic transmission, in particular to a Stirling hydraulic power device based on direct conversion from heat energy to hydraulic energy.

Background

The stirling engine is an externally heated (or combustion) piston engine, which operates in a closed thermal cycle with gas as the working medium. The Stirling engine mainly comprises an external heat supply (or combustion) system, a working circulation system, a transmission system, an auxiliary system and a monitoring system.

For the traditional stirling engine, when the two pistons output power, the connection of power output is generally performed through a transmission mechanism, for example, a crank link mechanism, a diamond mechanism, a swash plate transmission mechanism, a flywheel and other mechanisms are directly and mechanically connected with the cold and hot cylinder pistons, and the independent control of the two pistons cannot be realized.

Disclosure of Invention

In accordance with the technical problem set forth above, a stirling hydraulic power plant is provided which is based on the direct conversion of thermal energy to hydraulic energy. The invention can achieve the effect of changing the motion phase difference of the two pistons by controlling the period and the phase of the input signal of the electromagnetic valve. The hydraulic oil output by the two output ends is controlled by the reversing valve at the side, so that the output decoupling of the piston is realized, and the system integration level can be improved. The technical means adopted by the invention are as follows:

a stirling hydraulic power plant based on direct conversion of thermal energy to hydraulic energy comprising: a hot end Stirling piston cylinder, a cold end Stirling piston cylinder, a hot end Stirling piston and a cold end Stirling piston, the hot end Stirling piston cylinder and the cold end Stirling piston cylinder are communicated with each other through an air passage, the hot end Stirling piston is arranged in the hot end Stirling piston cylinder, the cold end Stirling piston is arranged in the cold end Stirling piston cylinder, the hot end Stirling piston and the cold end Stirling piston are respectively connected with a hydraulic cylinder piston in the double-acting hot end hydraulic cylinder and a cold end hydraulic cylinder piston in the double-acting cold end hydraulic cylinder through piston rods, the double-acting hot end hydraulic cylinder and the double-acting cold end hydraulic cylinder are respectively communicated through a first electromagnetic valve and a second electromagnetic valve, the movement phase difference of the hot-end Stirling piston and the cold-end Stirling piston is changed by controlling the period and the phase of input signals of the first electromagnetic valve and the second electromagnetic valve.

The heat regenerator is arranged on a communication channel between the hot end Stirling piston cylinder and the cold end Stirling piston cylinder, the heater is arranged on the side of the hot end Stirling piston cylinder, and the cooler is arranged on the side of the cold end Stirling piston cylinder.

Further, the first electromagnetic valve is a two-position three-way reversing valve, and the second electromagnetic valve is a two-position four-way electromagnetic valve.

Furthermore, one passage of the first electromagnetic valve is connected to the rodless cavity side of the double-acting hot-end hydraulic cylinder, the other two passages are connected with a high-pressure oil source, the rod cavity of the double-acting hot-end hydraulic cylinder is connected with external air, two passages of the second electromagnetic valve are connected to the rodless cavity side and the rod cavity side of the double-acting cold-end hydraulic cylinder, and the other passage is connected to the oil tank.

The invention provides a new scheme for directly outputting high-pressure oil by a power piston, which is different from a mechanical connecting rod device adopted by the traditional Stirling engine through the direct combination of a hydraulic transmission device and a Stirling engine, and comprises the following steps: because the flywheel of the traditional Stirling engine is directly connected with the cold and hot cylinder pistons, the independent control of the two pistons cannot be realized, the free piston design of the design can decouple the motion of the two pistons, and realize the separation control of the output oil of the two pistons, so the volume is compact, and the efficiency is higher. Meanwhile, the power part has the advantages of low noise, good mechanical balance, large variable stroke and long service life of the traditional Stirling engine. Because the air can be communicated to supplement the medium to enable the piston to move up and down, the complexity of system design is reduced, energy loss is reduced, and the leakage problem of hydraulic oil used at the end is avoided.

Based on the reason, the invention can be widely popularized in the field of new energy driving hydraulic transmission.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of a free piston stirling hydraulic device of the present invention.

Fig. 2 is a phase independent control map of the hot end piston output in an embodiment of the present invention.

FIG. 3 is a phase independent control map of cold end piston output in an embodiment of the present invention.

In the figure: 1. a heat regenerator; 2. a heater; 3. a cooler; 4. a hot end stirling piston cylinder; 5. a cold end stirling piston cylinder; 6. a hot-end stirling piston; 7. a cold end stirling piston; 8. a hot end hydraulic cylinder piston; 9. a double-acting hot-end hydraulic cylinder; 10. a cold end hydraulic cylinder piston; 11. a double-acting cold-end hydraulic cylinder; 12. a two-position four-way solenoid valve; 13. an oil tank; 14. two-position three-way solenoid valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the present invention discloses a stirling hydraulic power plant for directly converting thermal energy into hydraulic energy, comprising: the hydraulic oil reversing device comprises a hydraulic power output part of a hot end cylinder and a hot end double-acting hydraulic cylinder, a gas distribution part of a cold end cylinder and a cold end double-acting hydraulic cylinder, a hydraulic oil reversing device consisting of an electromagnetic reversing valve and a necessary switch valve, a communication device for communicating a cold cylinder and a hot cylinder, a heat regenerator, a hydraulic oil and air filtering device, a high-pressure oil source and seals at all positions.

The method specifically comprises the following steps: a hot end Stirling piston cylinder, a cold end Stirling piston cylinder, a hot end Stirling piston and a cold end Stirling piston, the hot end Stirling piston cylinder and the cold end Stirling piston cylinder are communicated with each other through an air passage, the hot end Stirling piston is arranged in the hot end Stirling piston cylinder, the cold end Stirling piston is arranged in the cold end Stirling piston cylinder, the hot end Stirling piston and the cold end Stirling piston are respectively connected with a hydraulic cylinder piston in the double-acting hot end hydraulic cylinder and a cold end hydraulic cylinder piston in the double-acting cold end hydraulic cylinder through piston rods, the double-acting hot end hydraulic cylinder and the double-acting cold end hydraulic cylinder are respectively communicated through a first electromagnetic valve and a second electromagnetic valve, the movement phase difference of the hot-end Stirling piston and the cold-end Stirling piston is changed by controlling the period and the phase of input signals of the first electromagnetic valve and the second electromagnetic valve.

The heat regenerator is arranged on a communication channel between the hot end Stirling piston cylinder and the cold end Stirling piston cylinder, the heater is arranged on the side of the hot end Stirling piston cylinder, and the cooler is arranged on the side of the cold end Stirling piston cylinder. Gas flows between the two cylinders via the regenerator.

The hydraulic oil reversing device comprises: the electromagnetic switch valve, two-position four-way solenoid valve and two-position three-way solenoid valve. All seals of this section are also included. One passage of the first electromagnetic valve is connected to the rodless cavity side of the double-acting hot-end hydraulic cylinder, the other two passages are connected with a high-pressure oil source, the rod cavity of the double-acting hot-end hydraulic cylinder is connected with external air, two passages of the second electromagnetic valve are connected to the rodless cavity side and the rod cavity side of the double-acting cold-end hydraulic cylinder, and the other passage is connected to the oil tank.

The hydraulic oil in the rodless cavity of the double-acting hot end hydraulic cylinder is controlled by the two-position four-way electromagnetic valve, can be pressurized by the Stirling piston and output as high-pressure oil, and the hydraulic oil is supplemented from the oil tank through the two-position four-way electromagnetic valve when the volume of the rodless cavity is increased. The hydraulic oil in the rodless cavity and the hydraulic oil in the rod cavity of the double-acting cold-end hydraulic cylinder are controlled by a two-position three-way electromagnetic valve, the cold-end hydraulic cylinder piston can be supplemented from a high-pressure oil source when moving downwards, the high-pressure oil source is pressure oil input by the hydraulic cylinder, high pressure is not needed, and the cold-end hydraulic cylinder piston flows to an oil tank when moving upwards. The high-pressure oil source includes all of the pump oil pressure devices for providing the piston back-driving force.

Specifically, the oil tank is also provided with a filter, and the air pipeline is also provided with an air pressure balancing device, an air filter and a necessary dryer, wherein the air pressure balancing device is used for supplementing the pressures at the two ends of the piston acting and returning.

In the specific implementation of this embodiment, the two-position three-way directional valve and the two-position four-way electromagnetic valve are respectively connected to the independent control signals shown in fig. 2 and 3, so that the directional valve is located at different positions, and further the flow direction of the hydraulic oil is controlled, specifically,

when the hot-end Stirling piston moves forwards (the piston moves downwards along the vertical direction in the figure 1), the hot-end Stirling piston pushes the hydraulic piston of the hot-end hydraulic cylinder to do work so as to enable the hot-end hydraulic cylinder to move downwards, the hydraulic cylinder outputs high-pressure oil, and meanwhile, the rod cavity replenishes air. When the hot-end Stirling piston returns (the piston moves upwards along the vertical direction of the figure 1), the high-pressure oil source applies work to the hydraulic piston of the hot-end hydraulic cylinder through the two-position three-way reversing valve to return, and the rod cavity of the hydraulic cylinder exhausts air to the atmosphere.

When the cold cylinder Stirling piston moves forwards (the piston moves upwards along the vertical direction of the figure 1), the high-pressure oil source applies work to the hydraulic cylinder piston through the reversing valve, so that the cold end Stirling piston moves upwards, and the chamber of the rodless part of the hydraulic cylinder replenishes hydraulic oil from the oil source and discharges the hydraulic oil to the oil tank from the chamber on the other side of the hydraulic oil. When the cold-end Stirling piston returns (the piston moves downwards along the vertical direction of the figure 1), a high-pressure oil source is introduced into the cavity with the rod part through the reversing valve to apply work to the cold-end hydraulic cylinder piston, and the hydraulic lower cavity cylinder discharges high-pressure oil.

When the cold end hydraulic cylinder piston outputs expansion work, the hydraulic cylinder rodless cavity discharges high-pressure oil, and when the hot end Stirling piston or the cold end Stirling piston returns, the high-pressure oil source applies work to the hot end hydraulic cylinder piston or the cold end hydraulic cylinder piston through the reversing valve.

The embodiment of the invention is a power device for directly converting heat energy into hydraulic energy, has high efficiency, simultaneously can independently control the output of two pistons due to the superiority of the free piston Stirling engine, and can change the motion phase difference of the pistons at the two ends through elements such as a valve and the like.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.