CN213598069U

CN213598069U - Free piston power plant with built-in gas spring

Info

Publication number: CN213598069U
Application number: CN202022525244.5U
Authority: CN
Inventors: 张驰; 陈飞雪; 邱书恒; 李征; 裴天佑; 张�杰; 熊次远
Original assignee: Ningbo Institute of Material Technology and Engineering of CAS
Current assignee: Ningbo Institute of Material Technology and Engineering of CAS
Priority date: 2020-11-04
Filing date: 2020-11-04
Publication date: 2021-07-02
Anticipated expiration: 2030-11-04

Abstract

The utility model discloses a free piston power generation facility with built-in gas spring, it includes combustion chamber (2), the symmetry is provided with two combustion chamber pistons in combustion chamber (2), and each combustion chamber piston is connected with the active cell transmission of linear generator (3), and each linear generator (3) is inside still to be provided with a gas spring (1), gas spring (1) are used for cooperating with corresponding linear generator (3) active cell, and in the hollow structure of the corresponding linear generator (3) active cell of at least local embedding of gas spring (1). The utility model provides a free piston power generation system has advantages such as simple structure compactness, high efficiency and high power density at least.

Description

Free piston power plant with built-in gas spring

Technical Field

The utility model relates to a free piston internal combustion linear generator system, concretely relates to high power density linear generator system who has been equipped with multistage answer gas spring belongs to the car and increases journey ware field.

Background

The pure electric vehicle has the defects of short endurance mileage, large battery size and heavy mass, and the development of a high-efficiency high-power-density range extender becomes a research hotspot of the vehicle power system at the present stage. Most of the existing range extenders are power generation systems formed by combining a traditional internal combustion engine and an external rotary generator, and the reciprocating motion of a piston pushed by the combustion of fuel needs to be converted into rotary motion through a crankshaft connecting rod to drive the generator to convert kinetic energy into electric energy. Such a conversion process requires a complex mechanical structure, and the conversion link has a large mechanical loss, which is not favorable for efficient operation of the system. In order to further improve the power generation efficiency and performance of the system, the development of the power generation system with high fuel utilization rate, compact structure and low loss is urgent.

The free piston internal combustion linear generator system is a kind of power generation system which makes the internal combustion engine and linear generator implement linear coupling. The pressure generated in the cylinder by the heat released by the fuel oil vertically acts on the linear piston assembly to push the rotor of the linear generator to cut magnetic lines of force in a reciprocating manner, so that electric energy is generated. The device has the characteristics of compact structure, small friction loss and high efficiency. However, the existing free piston internal combustion linear generator system generally arranges the internal combustion engine, the linear generator and the return device in a linear manner, so that a long space is occupied, and a certain redundant space exists in the power generation system. In addition, the connecting pieces at the joints of the components in the existing free piston internal combustion linear generator system can also increase the mass of the motor rotor, which is not beneficial to improving the motion frequency of the system, and thus the existing free piston internal combustion linear generator system generally has the defects of heavy mass of the motor rotor, low volume power density and the like.

SUMMERY OF THE UTILITY MODEL

The main object of the present invention is to provide a free piston power generation device with a built-in gas spring, so as to overcome the disadvantages of the prior art.

In order to achieve the purpose of the utility model, the utility model adopts the technical scheme that:

the embodiment of the utility model provides a free piston power generation facility with built-in gas spring, it includes the combustion chamber, be provided with an at least combustion chamber piston in the combustion chamber, each combustion chamber piston is connected with linear generator's active cell transmission, and each linear generator is inside still to be provided with a gas spring, gas spring be used for with corresponding linear generator active cell cooperation, and in the hollow structure of the corresponding linear generator active cell of at least local embedding of gas spring.

In some embodiments, two combustion chamber pistons are symmetrically arranged in the combustion chamber, each combustion chamber piston is in transmission connection with a rotor of a linear generator, and the two linear generators are in mirror symmetry with respect to a transverse symmetry axis of the combustion chamber.

In some embodiments, a linear guide limiting mechanism is further disposed between the linear generator rotor and the gas spring cylinder.

In some embodiments, a self-lubricating polymer skeleton is arranged between the outer wall of the gas spring cylinder and the inner wall of the linear generator rotor.

Compare prior art, the embodiment of the utility model provides a free piston power generation system has advantages such as simple structure compactness, high efficiency and high power density at least.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.

Fig. 1 is a schematic structural diagram of a free-piston internal combustion linear generator system according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a free piston internal combustion linear generator system in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a mover assembly and a gas spring according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a mover assembly according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a gas spring chamber according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a combustion chamber according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a free piston internal combustion linear generator system equipped with a plate generator according to another embodiment of the present invention;

description of reference numerals: the linear generator comprises a gas spring 1, a combustion chamber 2, a linear generator 3, a gas spring piston 4, a gas spring cylinder 5, a piston rod 6, a permanent magnet 7, a combustion chamber air inlet 8, a combustion chamber piston 9, a combustion chamber accessory mounting seat 10, a combustion chamber cavity 11, a combustion chamber exhaust port 12, an armature winding 13, a stator silicon steel sheet 14, a motor shell 15, a combustion chamber transverse symmetry axis 16, a combustion chamber longitudinal symmetry axis 17, a guide hole 18, a framework vent 19, a gas spring end cover 20, a gas spring air supplement port 21, a self-lubricating polymer framework 22, a guide block 23, a gas spring air supplement port 24, a piston rod guide hole 25, a combustion chamber cavity wall 26, a spark plug mounting hole 27, an oil injector mounting hole 28, a combustion chamber connecting flange 29 and a double-side long stator rotor flat plate linear generator 30.

Detailed Description

An embodiment of the utility model provides a pair of free piston power generation facility with built-in gas spring includes the combustion chamber, be provided with an at least combustion chamber piston in the combustion chamber, each combustion chamber piston is connected with linear generator's active cell transmission, and each linear generator is inside still to be provided with a gas spring, gas spring be used for with corresponding linear generator active cell cooperation, and in the hollow structure of the corresponding linear generator active cell of at least local embedding of gas spring. By adopting the arrangement mode, the length of the occupied space of the free piston power generation system can be greatly shortened, the structure is simpler and more compact, the number of connecting pieces can be greatly reduced, and the power density, the efficiency and the like of the free piston power generation system can be effectively improved.

In some embodiments, two combustion chamber pistons are symmetrically arranged in the combustion chamber, each combustion chamber piston is in transmission connection with a rotor of a linear generator, and the two linear generators are in mirror symmetry with respect to a transverse symmetry axis of the combustion chamber. Furthermore, the two sets of linear generators and the gas spring are distributed along the central axis of the combustion chamber.

In some embodiments, the gas spring comprises a gas spring cylinder and a gas spring piston arranged in the gas spring cylinder, and the gas spring piston and the mover of the corresponding linear generator are in transmission connection with the corresponding combustion chamber piston through a piston rod.

In some embodiments, a piston rod guide hole is further formed in the gas spring cylinder, and the piston rod guide hole is matched with the piston rod, so that the piston rod can linearly reciprocate along the axial direction, and the piston rod is prevented from moving in the direction deviated from the axial direction.

In some embodiments, a self-lubricating polymer skeleton is arranged between the outer wall of the gas spring cylinder and the inner wall of the linear generator rotor. By utilizing the self-lubricating polymer framework, the rotor of the linear generator can slide on the outer wall of the gas spring in a reciprocating manner with small friction force.

In some embodiments, a linear guide limiting mechanism is further disposed between the linear generator rotor and the gas spring cylinder. The linear guide limiting mechanism is used for ensuring that the linear generator rotor linearly reciprocates along the axial direction, and preventing the linear generator rotor from moving in a direction deviating from the axial direction, such as preventing the linear generator rotor from rotating around the axis. The linear guide stop mechanism may be of a suitable type known per se.

As one of preferable embodiments, the linear guide limiting mechanism includes a guide groove or a guide rail and a guide block which are slidably engaged with each other, any one of the guide groove or the guide rail and the guide block is disposed on an inner wall of the rotor of the linear generator or the self-lubricating polymer skeleton, and the other one is disposed on an outer wall of the gas spring cylinder. Further, the guide groove or the guide rail extends along a moving direction of the linear generator mover.

In some embodiments, the rotor and the self-lubricating polymer skeleton of the linear generator are fixedly connected to the corresponding piston rod.

In some embodiments, each gas spring piston and the corresponding combustion chamber piston are secured to respective ends of a piston rod.

In some embodiments, the mover of the linear electric generator, the gas spring cylinder of the gas spring, and the combustion chamber are coaxially disposed.

Further, the cylinder diameter of the gas spring can be adjusted according to the size of the inner cavity of the linear generator, and can be expanded to a compression mode larger than 2 stages.

In some embodiments, the gas spring cylinder tail end of the gas spring is also in sealing connection with a gas spring end cover, and the gas spring end cover is in positioning connection with the motor shell of the corresponding linear generator in a shaft hole matching manner.

In some embodiments, the gas spring cylinder wall of the gas spring is further provided with a gas spring gas supplementing port and a framework gas vent, and the inner cavity of the gas spring cylinder is communicated with the external atmosphere through the framework gas vent.

In some embodiments, the combustion chamber is fixedly connected to the linear generator by means of a combustion chamber connection flange.

In some embodiments, the configuration of the linear generator includes any one of a cylindrical long mover and short stator configuration, a flat plate long or short mover and a short or long stator configuration, but is not limited thereto.

For example, the linear generator may adopt a cylindrical long stator or short mover structure, wherein the permanent magnet arrangement of the mover may be of a Halbach type.

Further, if the linear generator has a flat plate configuration, the linear generator may be arranged in a circumferential direction or a horizontal direction according to an arrangement space.

In some embodiments, the linear electric generator comprises a stator comprising coil windings and magnetically conductive silicon steel laminations, and a mover comprising permanent magnets and back iron.

In some embodiments, the permanent magnets may be arranged in a radial or transverse direction.

In some embodiments, the stator of the linear generator comprises an armature winding, wherein the armature winding is an air coil and is embedded in a stator silicon steel sheet.

In some embodiments, the configuration of the linear generator may be circular or square, and the configuration of the mover may be a moving magnet or a moving coil.

The principles and operation of the present invention will be described in detail below with reference to specific embodiments and drawings, it being understood that the specific embodiments described herein are merely illustrative of relevant matters and are not limiting of the present invention. It should be noted that, for convenience of description, only the parts related to the present invention are shown in the drawings.

Referring to fig. 1-2, a free piston internal combustion linear generator system according to an embodiment of the present invention is shown, which mainly includes a combustion chamber 2, two sets of linear generators 3 and two sets of gas springs 1, wherein each gas spring 1 is disposed inside one linear generator 3, and is distributed symmetrically.

Further, the combustion chamber 2 is a central combustion chamber provided with two opposed combustion chamber pistons 9. Here, the combustion chamber intake port 8, the combustion chamber exhaust port 12, and the like are disposed at equal intervals on both sides of the combustion chamber transverse symmetry axis 16. The combustion chamber piston 9 has a symmetrical reciprocating motion law, and the combustion chamber piston 9 is located at the piston top dead center position in fig. 1.

Preferably, the two sets of pistons 9, the linear generator 3 and the gas spring 1 may be arranged in a mirror symmetry along the central axis of the combustion chamber 2.

Further, the moving assembly of the linear generator 3, i.e. the mover, comprises a permanent magnet 7 and a back iron. The gas spring 1 includes a gas spring cylinder 5, a piston rod 6, a gas spring piston 4, and the like.

Preferably, the two sets of combustion chamber pistons 9, the linear generator 3, the gas spring 1 and the combustion chamber 2 are all coaxially arranged.

Further, the permanent magnet 7 of the linear generator 3 is connected with the corresponding piston rod 6 through the self-lubricating polymer framework 22, and the piston rod 6 is connected with the corresponding combustion chamber piston 9. And the permanent magnet 7 and the self-lubricating polymer skeleton 22 of the linear generator 3 can slide on the corresponding gas spring cylinder 5 in a reciprocating manner along a straight line.

Further, the basic unit of the number of the stages of the permanent magnets 7 of the linear generator 3 and the number of the slots of the stator silicon steel sheets 14 is matched into 5-pole 6-slot. The armature winding 13 in the fixed assembly of the linear generator 3 is an air coil and can be embedded into the stator silicon steel sheet 14.

Further, the gas spring 1, the combustion chamber 2 and the linear generator 3 can be positioned and connected through the combustion chamber connecting flange 29, the gas spring end cover 20 and the motor casing 15 in a shaft hole matching manner.

Referring to fig. 3-5, in this embodiment, one or more guide blocks 23 may be disposed on the outer wall of the gas spring cylinder 5, and the one or more guide blocks 23 may be slidably engaged with the guide holes 18 of the self-lubricating polymer skeleton 22, so as to better guide the linear motion and limit the rotation of the moving assembly during the linear reciprocating motion. The guide hole 18 is preferably a strip-shaped hole extending in the axial direction of the piston rod and may also take the form of a strip-shaped groove.

Further, the gas spring cylinder 5 may be provided with a gas spring supply port 21, a gas spring supply port 24, and the like, and an inner cavity thereof may be communicated with the outside atmosphere through the frame vent port 19. The combustion chamber piston 9 is fixedly connected with the piston rod 6 and the gas spring piston 4. Meanwhile, a gas spring end cover 20 for sealing and positioning the gas spring cylinder 5 is attached to the rear end of the gas spring cylinder 5, thereby forming a gas spring chamber.

Further, referring to fig. 6, the combustion chamber 2 of the embodiment may be further provided with a combustion chamber intake port 8, a combustion chamber exhaust port 12, a spark plug mounting hole 27, a fuel injector mounting hole 28, etc., which may be arranged in a manner and at positions known in the art.

The gas spring of this embodiment can also be considered as a two-chamber, two-piston, two-stage compression configuration, which can be understood as being formed by two equally-sized cavities spaced apart in the middle, each cavity being provided with a piston and a piston ring (not shown), and two gas supplementing ports for communicating with the atmosphere being provided in the initial position of the gas spring.

The combustion chamber of this embodiment may be considered a central combustion chamber configuration of a single chamber piston. When the combustion chamber is injected and ignited, the pistons 9 on two sides can be pushed simultaneously, so that the unbalance of the system can be eliminated.

The linear generator of this embodiment may have a circular or square configuration, and the mover may be configured in the form of a moving magnet or a moving coil.

The free piston internal combustion linear generator system of the embodiment has the advantages of simple and compact structure, high efficiency, high power density and the like.

In still other embodiments, the combustion chamber may be configured in a single cylinder, single chamber configuration, depending on power requirements.

In other embodiments, the free piston internal combustion linear generator system can be used as a single module, and multiple modules can be expanded and overlapped according to different power supply requirements.

In some other embodiments, the linear generator may also be a cylindrical long mover and short stator configuration or a flat plate long or short mover and short or long stator configuration. If a flat plate configuration is adopted, the arrangement may be divided into a circumferential direction arrangement or a horizontal direction arrangement according to the arrangement space. For example, referring to fig. 7, in another exemplary embodiment, a free piston internal combustion linear generator system is provided with a flat plate motor in which a double-sided stator mover flat plate linear generator 30 is horizontally disposed on both sides of a gas spring, and a mover thereof is connected to a moving assembly.

The above-mentioned embodiment is to the technical solution of the present invention has been described in detail, it should be understood that the above is only the specific embodiment of the present invention, not used for limiting the present invention, any modification, supplement or similar mode replacement etc. that the principle scope of the present invention is in should be included in the protection scope of the present invention.

Claims

1. The free piston power generation equipment with the built-in gas spring is characterized by comprising a combustion chamber (2), wherein at least one combustion chamber piston is arranged in the combustion chamber (2), each combustion chamber piston is in transmission connection with a rotor of a linear generator (3), a gas spring (1) is further arranged inside each linear generator (3), the gas spring (1) is used for being matched with the corresponding rotor of the linear generator (3), and the gas spring (1) is at least partially embedded into a hollow structure of the corresponding rotor of the linear generator (3).

2. The free-piston power plant with an inbuilt gas spring as claimed in claim 1, characterized in that: two combustion chamber pistons are symmetrically arranged in the combustion chamber (2), each combustion chamber piston is in transmission connection with a rotor of a linear generator (3), and the two linear generators (3) are in mirror symmetry relative to a transverse symmetry axis (16) of the combustion chamber (2).

3. The free-piston power plant with an inbuilt gas spring as claimed in claim 1 or 2, characterized in that: the gas spring (1) comprises a gas spring cylinder (5) and a gas spring piston (4) arranged in the gas spring cylinder (5), and the gas spring piston (4) and a rotor of the corresponding linear generator (3) are in transmission connection with the corresponding combustion chamber piston through a piston rod (6).

4. A free-piston power plant with an inbuilt gas spring as claimed in claim 3, characterized in that: a linear guide limiting mechanism is further arranged between the rotor of the linear generator (3) and the gas spring cylinder (5); and/or a self-lubricating polymer framework (22) is arranged between the outer wall of the gas spring cylinder (5) and the inner wall of the rotor of the linear generator (3).

5. The free-piston power plant with an inbuilt gas spring as claimed in claim 4, characterized in that: the linear guide limiting mechanism comprises guide holes (18) or guide rails and guide blocks (23) which are in sliding fit with each other, any one of the guide holes (18) or the guide rails and the guide blocks (23) is arranged on the inner wall of a rotor of the linear generator (3) or a self-lubricating high polymer framework (22), the other one of the guide holes (18) or the guide rails is arranged on the outer wall of the gas spring cylinder (5), and the guide holes (18) or the guide rails extend along the movement direction of the rotor of the linear generator (3).

6. The free-piston power plant with an inbuilt gas spring as claimed in claim 4, characterized in that: and a rotor of the linear generator (3) and the self-lubricating polymer framework (22) are fixedly connected with the corresponding piston rod (6).

7. The free-piston power plant with an inbuilt gas spring as claimed in claim 1, characterized in that: the stator of the linear generator (3) comprises an armature winding (13), and the armature winding (13) is an air coil and is embedded into a stator silicon steel sheet (14).

8. The free-piston power plant with built-in gas spring according to any one of claims 1-2, 4-7, characterized in that: the rotor of the linear generator (3), the gas spring cylinder (5) of the gas spring (1) and the combustion chamber (2) are coaxially arranged.

9. The free-piston power plant with built-in gas spring according to any one of claims 1-2, 4-7, characterized in that: the tail end of a gas spring cylinder (5) of the gas spring (1) is also in sealing connection with a gas spring end cover (20), and the gas spring end cover (20) is in positioning connection with a motor shell (15) of the corresponding linear generator (3) in a shaft hole matching mode; and/or a gas spring air supplement port and a framework air vent are further arranged on the wall of a gas spring cylinder (5) of the gas spring (1), and the inner cavity of the gas spring cylinder (5) is communicated with the outside atmosphere through the framework air vent; and/or the combustion chamber (2) is fixedly connected with the linear generator (3) through a combustion chamber connecting flange (29).

10. The free-piston power plant with built-in gas spring according to any one of claims 1-2, 4-7, characterized in that: the configuration of the linear generator (3) comprises any one of a cylindrical long rotor and short stator configuration, a flat plate long or short rotor and a short or long stator configuration.