CN111997693B

CN111997693B - Compressed air power generator

Info

Publication number: CN111997693B
Application number: CN202010890069.1A
Authority: CN
Inventors: 蔡志强; 潘黎劲; 庹汉郧; 陈龙
Original assignee: Dongfeng Motor Corp
Current assignee: Dongfeng Motor Corp
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2021-09-03
Anticipated expiration: 2040-08-28
Also published as: CN111997693A

Abstract

The invention belongs to the technical field of power generation, and discloses a compressed air power generator which comprises a piston, a shell, a return spring, a gas drainage pipeline, a gas inlet pipeline and a gas storage tank. The piston body is made of permanent magnet material, the middle part of the piston body is provided with an annular groove which forms a communicating chamber with the inner wall of the machine body, and the top of the piston and one end of the machine body close to the exhaust valve form a gas expansion chamber. The middle part of the machine shell is provided with an air inlet and an air outlet, the top part of the machine shell is provided with an air nozzle and an air outlet, and electromagnetic coils are distributed in the machine shell. Compressed air is used as power to push the piston to do work to generate electricity, only a physical change process is needed, and the environment is not polluted. The switching of air inlet and exhaust is realized by changing the position relation between the annular groove on the piston and the air hole on the inner wall of the shell, so that the valve control is greatly reduced, the equipment resource is saved, the occupied area is reduced, and the reliability of the equipment is improved. The energy-saving device can be used by various industrial and mining enterprises and buildings and houses, and can be used as energy for storing electric energy and being called under emergency conditions.

Description

Compressed air power generator

Technical Field

The invention belongs to the technical field of power generation and discloses a compressed air power generator.

Background

The electric energy belongs to the secondary energy, in the alternating current power generation process, the power generation plant generates electricity according to the demand of power consumption, that is to say, how much electricity is needed for generating electricity, if the power consumption is not matched with the generated energy, the power grid frequency can be greatly influenced, the power plant can adjust the demand through the difference of peak-valley electricity prices for the balanced operation of the generator, the automatic off-peak power consumption selection of enterprises is realized, so that the problem that the distributed storage of the electric energy needs to be considered by the current power generation industry and industrial power consumers is called, and the power generation devices in various forms are widely applied among enterprises of different types.

Free piston alternators have great efficiency potential. Free piston alternators are generally alternators having pistons that are freely movable in their own motion path, not connected to crankshafts, gears, flywheels, etc., and piston bodies that are partly or wholly permanent magnets. In almost all free piston alternators, the piston is moved by high temperature and high pressure gas generated by combustion, causing a change in the magnetic flux inside the solenoid, thereby generating an electric current. Such a free piston alternator has the following problems: firstly, a large amount of carbon dioxide, nitrogen oxides, particulate matters and the like can be generated by combustion, so that the environment is polluted; secondly, the combustion process of some schemes needs an ignition device for ignition, so that the mechanical mechanism and the control method are relatively complex; in addition, the high temperature generated by combustion has a great influence on the structural strength and the like.

Experts practice various clean energy storage and calling modes, try to store low-cost electricity in the valley of the electricity consumption and put the electricity into use in the peak of the electricity consumption. For example, the power of a computer center in a certain automobile manufacturing industry is provided by two independent substations, if the power grid of one substation fails, the other substation can be rapidly involved, and if the two substations both fail, the flywheel energy storage gas system can be on the ground. The rotor of the energy storage device in the center of the computer weighs 3 tons, when the power supply is normal, the rotor runs uninterruptedly at the rotating speed of 3300 revolutions per minute, when the power is temporarily cut off, the rotor can be completely static only in 30 seconds, and all kinetic energy is sent into the generator and converted into electric energy, so that the emergency power supply effect is achieved. However, the method for converting the stored kinetic energy into the electric energy can be continued for a short time, and the rotor is large in size and limited in space and can only be used as emergency power generation.

The China invention patent application with the publication number of CN106246229A discloses a renewable energy free piston type linear generator, which utilizes the homopolar repulsive potential energy and compressed air energy of a neodymium iron boron permanent magnet to push a permanent magnet double-end piston to move and cut a magnetic induction line to generate electric energy and heat energy of induced current, can convert the electric energy in the power consumption valley into compressed air energy through an air compressor for storage, and convert the stored compressed air energy into electric energy through the linear generator in the power consumption peak, but the cyclic on-off of two air inlet and exhaust pipes of each power generation unit is completed by a plurality of electromagnetic valves, so that pipelines and valves are more, air leakage caused by valve blockage, clamping stagnation and valve abrasion often occurs, the reliability is lower, and each stroke is reset by a magnetic field, and the induced current can be generated on a shell to cause leakage loss or potential safety hazard.

Disclosure of Invention

In order to solve the problems in the background art, the invention provides a compressed air power generator, which has the following specific technical scheme:

the utility model provides a compressed air power generator, includes piston, casing, return spring, bleed pipe, bleed valve, intake pipe, blast pipe, tail pipe and gas holder the casing middle part is provided with the bleed mouth, store up compressed air in the gas holder, the gas holder export is passed through the bleed pipe with bleed mouth intercommunication, the bleed valve is installed on the bleed pipe, control bleed pipe break-make, the whole cylindric that is of piston is made by permanent magnetic material, can slide in the casing intracavity, and periphery and the laminating of casing inner wall have inlayed solenoid between the casing inner and outer wall, works as when the piston cylinder is in vertical direction, and its middle part is provided with coaxial annular groove one, the part more than coaxial annular groove is piston upper portion, the part below the coaxial annular groove one is the piston lower part, the annular groove one forms the UNICOM room with the casing inner wall, the regional gaseous expansion room that forms between piston top and the casing inner chamber top, terminal surface under the return spring axial perpendicular to piston, set up in between at the bottom of piston bottom and the inner chamber of casing the piston lower part is provided with coaxial annular groove two, coaxial annular groove two forms tail gas chamber with the casing inner wall the casing middle part still is provided with the air inlet, and the top is provided with air vent and gas vent, and the lower part is equipped with disappointing mouth and tail gas port, pass through between air inlet and the air vent the intake pipe is followed the outer intercommunication of casing, bleed pipe one end with bleed mouth intercommunication, the other end connect to the gas holder, gas vent and disappointing mouth pass through the blast pipe is followed the outer intercommunication of casing, tail pipe from the casing outside with the tail gas port is connected.

When the piston is positioned at the top dead center, the air inlet and the air-entraining port are both communicated with the communicating chamber, the air discharging port is sealed by the lower part of the piston, and the position of the tail air port is positioned on the wall of the machine shell below the end surface of the lower part of the piston; when the piston moves downwards from the upper dead point, the outer peripheral surface of the upper part of the piston can seal the air inlet until the piston moves to the lower dead point, the air introducing port is always positioned on the inner wall of the communicating chamber, and when the piston is positioned at the lower dead point, the air discharging port and the air discharging port are communicated with the tail air chamber. Therefore, except for the bleed air valve arranged on the bleed air pipe at the inlet end of the generator, the opening and closing of other pipelines are completed through the reciprocating motion of the piston, no other valve is provided, the pressure drop is small, the energy consumption is low, the clamping stagnation is reduced, and the reliability is high.

Preferably, in order to avoid the compressed gas from being discharged out of the generator and causing waste of air energy, the tail gas chamber is connected with the compressor through a tail gas exhaust pipe, and the tail gas passes through the gas storage tank after being compressed again and then enters the bleed air pipe for recycling. The noise caused by the compressed air discharge can be well reduced by the mode.

Preferably, the compressed air generator further comprises a control system, the bleed valve is an automatic control valve, a limiting boss is arranged at the top dead center of the piston in the casing, and a position sensor is arranged at the bottom of the casing and can return position information at the bottom of the piston to the control system to control the bleed valve to act. Therefore, the stroke of the piston can be accurately controlled, the generator operates stably, and all indexes of generated electricity are stable.

Preferably, in order to buffer the motion load uniformly, a plurality of return springs are uniformly distributed on the lower end face of the piston.

Compared with the prior art, the invention has the advantages that: environmental protection, economy, the motion valve member reduces by a wide margin, operates steadily, and the noise is low, and the efficiency is high, is fit for each industrial and mining enterprise and building hall institute to use as stand-by power supply.

Drawings

FIG. 1 is a schematic diagram of a generator piston in various operating positions according to an embodiment of the present invention.

In the figure, (a) the piston is in a top dead center position; (b) the position of the piston blocking the air inlet is shown schematically; (c) the piston is in a schematic diagram of a bottom dead center position; (d) the return spring enables the piston to ascend to return to the upper dead point;

1. a gas-introducing port; 2. an air inlet; 3. an air jet; 4. an exhaust port; 5. a bleed valve; 6. an air inlet pipe; 7. an exhaust pipe; 8. a housing; 9. an electromagnetic coil; 10. a piston; 11. an air intake communicating chamber; 12. a return spring; 13. an air escape opening; 14. a gas expansion chamber; 15. a bleed pipe; 16. a limiting boss; 17. a piston position sensor; 18. a tail pipe; 19. a tail gas chamber; 20. a tail gas port;

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from this embodiment without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, a compressed air power generator includes a piston 10, a casing 8, a return spring 12, an air-entraining pipe 15, an air-entraining valve 5, an air inlet pipe 6, an air outlet pipe 7, an air exhaust pipe 18, and an air storage tank, wherein an air-entraining port 1 is disposed in the middle of the casing 8, compressed air is stored in the air storage tank, an outlet of the air storage tank is communicated with the air-entraining port 1 through the air-entraining pipe 15, the air-entraining valve 5 is mounted on the air-entraining pipe 15 to control the on-off of the air-entraining pipe 15, the piston 10 is generally cylindrical and made of a permanent magnetic material and can slide in a cavity of the casing 8, the outer periphery of the piston is attached to the inner wall of the casing 8, an electromagnetic coil 9 is embedded between the inner wall and the outer wall of the casing 8, when a cylinder of the piston 10 is in a vertical direction, a coaxial annular groove i is disposed in the middle of the piston, more than one coaxial annular grooves are upper portions of the piston, and less than one coaxial annular groove is a lower portion of the piston, the first ring channel forms UNICOM room 11 with casing 8 inner wall, regional gaseous expansion chamber 14 that forms between piston 10 top and the 8 inner chamber tops of casing, purchase 7 totally with model return spring 12, terminal surface under the spring axial perpendicular to piston 10, the equipartition in between the piston 10 bottom and the 8 inner chamber of casing, terminal surface center is provided with coaxial annular groove two in the piston 10 lower part under the piston 10, coaxial annular groove two forms tail gas chamber 19 with the 8 inner wall of casing, casing 8 middle part still is provided with air inlet 2, and the top is provided with air jet 3 and gas vent 4, and the lower part is equipped with disappointing mouth 13 and tail gas mouth 20, communicates from casing 8 is outer through intake pipe 6 between air inlet 2 and the air jet 3, and bleed pipe 15 one end and bleed mouth 1 intercommunication, the other end connect to the gas holder, gas vent 4 and disappointing mouth 13 pass through the blast pipe 7 follows casing 8 communicates outward, the tail pipe 18 is connected to the tail gas port 20 from outside the casing 8.

When the piston 10 is positioned at the top dead center, both the air inlet 2 and the air introducing port 1 are communicated with the communicating chamber 11, the air discharging port 13 is sealed by the lower part of the piston, and the position of the tail gas port 20 is positioned below the end surface of the lower part of the piston 8 on the cavity wall of the machine shell 8; the concrete position should guarantee when the piston from top dead center downstream, piston 8 upper portion outer peripheral face can seal air inlet 2 until piston 8 moves to the bottom dead center, no matter how the UNICOM room shifts along with the piston, the position of bleed port 1 is located all the time on the inner wall of UNICOM's room, when the piston is located bottom dead center, leak port 13 and tail gas mouth 20 all with tail gas chamber 19 communicates. The tail pipe 18 is connected to the compressor, and the tail gas is compressed again and then enters the bleed pipe 15 after passing through the gas storage tank.

A limiting boss 16 is arranged at the top dead center of the piston movement in the machine shell 8, and a position sensor 17 is arranged at the bottom of the machine shell 8 and can transmit position information of the bottom of the piston 8 back to the control system to control the action of the bleed valve 5.

The working procedure of the generator mainly comprises three processes of sequential circulation, namely an air inlet expansion process, a free expansion process and a spring work-doing process. The intake expansion process and the free expansion process belong to a descending stroke, and the spring work-doing process belongs to an ascending stroke. The specific process is as follows:

and (3) an air inlet expansion process: when the generator is started, the air-bleed valve is firstly opened, and the air-bleed port 1 and the air inlet 2 are in a communicated state. The compressed air enters the communicating chamber 11 and then enters the gas expansion chamber 14 through the air inlet pipeline 6 to push the piston 10 to move downwards.

The free expansion process is as follows: when the piston 10 moves downwards, when the top of the piston runs to the air inlet 2, the head of the piston blocks the air inlet 2, at the moment, the free expansion process is carried out, air does not enter the air expansion chamber any more, and the compressed air in the air expansion chamber 14 releases pressure to push the piston to move downwards. When the exhaust chamber 19 communicates the exhaust pipe 7 with the tail pipe 18, the exhaust is started. The gas in the gas expansion chamber 14 is discharged out of the chamber through the tail pipe 18 until the piston 10 moves to the bottom dead center.

The spring working process: from the bottom dead center, the piston 10 starts to move upwards under the push of the return spring 12 and the air spring. After the piston 10 starts moving upward, the exhaust gas chamber 19 disconnects the exhaust pipe 7 and the tail pipe 18, and the exhaust is terminated. The piston 10 continues to move upwards, and as soon as the piston 10 moves to the vicinity of the top dead center, the communication chamber 11 puts the bleed air port 1 in communication with the air inlet port 2, and the gas expansion chamber 14 starts to intake air. When the piston 10 moves to the top dead center, i.e., the limit boss 16, the spring work process is ended and a new cycle begins.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a compressed air power generator, includes piston, casing, return spring, bleed pipe, bleed valve, intake pipe, blast pipe, tail pipe, gas holder the casing middle part is provided with the bleed mouth, store up compressed air in the gas holder, the gas holder export is passed through bleed pipe with bleed mouth intercommunication, the bleed valve is installed on the bleed pipe, control the break-make of bleed pipe, the whole cylindric that is of piston is made by permanent magnet material, can slide in the casing intracavity, and periphery and the laminating of casing inner wall have inlayed solenoid between the casing inner and outer wall, works as when the piston cylinder is in vertical direction, and its middle part is provided with coaxial annular groove one, the part more than coaxial annular groove is piston upper portion, the part below the coaxial annular groove one is the piston lower part, the annular groove one forms the UNICOM room with the casing inner wall, the region forms the gas expansion room between piston top and the casing inner chamber top, return spring axial perpendicular to piston lower extreme face, set up in between piston bottom and the casing inner chamber bottom, characterized by: the piston is provided with a coaxial annular groove II at the lower part, the coaxial annular groove II and the inner wall of the shell form a tail gas chamber, the middle part of the shell is also provided with a gas inlet, the top part of the shell is provided with a gas orifice and a gas outlet, the lower part of the shell is provided with a gas release port and a tail gas port, the gas inlet and the gas orifice are communicated from the outside of the shell through a gas inlet pipe, one end of a gas guide pipe is communicated with the gas orifice, the other end of the gas guide pipe is connected to the gas storage tank, the gas outlet and the gas release port are communicated from the outside of the shell through a gas exhaust pipe, and the tail gas pipe is connected with the tail gas port from the outside of the shell;

when the piston is positioned at the top dead center, the air inlet and the air-entraining port are both communicated with the communicating chamber, the air discharging port is sealed by the lower part of the piston, and the position of the tail air port is positioned on the wall of the machine shell below the end surface of the lower part of the piston; when the piston moves downwards from the upper dead point, the outer peripheral surface of the upper part of the piston can seal the air inlet until the piston moves to the lower dead point, the air introducing port is always positioned on the inner wall of the communicating chamber, and when the piston is positioned at the lower dead point, the air discharging port and the air discharging port are communicated with the tail air chamber.

2. A compressed air powered generator as claimed in claim 1 wherein: the tail gas pipe is connected with the compressor, and the tail gas is compressed again and then enters the air guide pipe after passing through the air storage tank.

3. A compressed air powered generator as claimed in claim 1 wherein: the automatic control device is characterized by further comprising a control system, the air entraining valve is an automatic control valve, a limiting boss is arranged at the top dead center of the piston in the casing, a position sensor is arranged at the bottom of the casing and can return position information at the bottom of the piston to the control system to control the air entraining valve to act.

4. A compressed air powered generator as defined in any one of claims 1 to 3 wherein: the return springs are multiple and are uniformly distributed on the lower end face of the piston.