Damping device for free piston Stirling generator

Abstract

The utility model provides a vibration damping device for a free piston Stirling generator, and particularly relates to the technical field of power generation equipment, the vibration damping device for the free piston Stirling generator comprises a generator main body and a vibration damping mechanism, the vibration reduction mechanism comprises an inertia pipe and a vibration damper, the vibration damper is fixed to the outer side of the generator body, a vibration reduction piston is arranged in the vibration damper, and a flowing working medium led out of the compression cavity flows into the vibration damper through the inertia pipe and drives the vibration damper to conduct movement vibration reduction. According to the utility model, passive vibration reduction can be realized by using the additional vibration reduction piston, self vibration reduction of the generator can be realized without external energy input, and the structure is simpler.

Description

Technical Field

[0001] This utility model relates to the field of power generation equipment technology, and in particular to a vibration reduction device for a free piston Stirling generator. Background Technology

[0002] The Stirling generator is a closed-cycle external combustion generator that can utilize renewable energy sources such as solar, geothermal, and hydrogen energy, as well as low-quality heat sources such as industrial waste heat and urban waste heat. It has a wide range of applications and does not produce polluting gases that pollute the environment during the heat exchange process.

[0003] Because Stirling generators have two pistons that move at high frequencies, the vibration of these pistons can cause vibration throughout the generator, affecting the reliability and stability of the system. This can lead to inaccurate experimental data or equipment failure. Therefore, it is necessary to solve the vibration problem of the generator. Existing vibration reduction methods for Stirling generators are mainly divided into active and passive vibration reduction. The most representative methods are dual-generator opposite vibration reduction, vibration reduction by sharing an expansion chamber or compression chamber between two generators, and the addition of an active vibration damper. However, these methods can make the entire device too large or require external energy input to achieve vibration reduction, resulting in a complex overall structure. Utility Model Content

[0004] To address the problems of existing vibration damping devices leading to excessively large generator sizes or complex overall systems, this invention proposes a vibration damping device for free-piston Stirling generators.

[0005] This utility model is achieved through the following technical solution:

[0006] This utility model proposes a vibration damping device for a free-piston Stirling generator, comprising a generator body and a vibration damping mechanism, wherein:

[0007] The generator body has a compression chamber inside, and the vibration damping mechanism includes the generator body and the vibration damping mechanism, wherein:

[0008] The generator body has a compression chamber inside. The vibration damping mechanism includes an inertial tube and a vibration damper. The vibration damper is fixed to the outside of the generator body. The vibration damper has a vibration damping piston inside. The flowing working fluid drawn out from the compression chamber flows into the vibration damper through the inertial tube and drives the vibration damper to perform motion damping.

[0009] Furthermore, the vibration damper includes an additional housing, which is sealed on the outside of the generator body. A vibration damping cylinder is disposed inside the additional housing, and a vibration damping piston is disposed inside the vibration damping cylinder. A vibration damping cavity is disposed between the top of the vibration damping cylinder and the additional housing. The two ends of the inertia tube are connected to the compression cavity and the vibration damping cavity.

[0010] Further, the damping mechanism further comprises a needle valve arranged on the inertia tube.

[0011] Further, the generator body further comprises a shell connected with the damping mechanism.

[0012] Further, the shell is internally provided with a power piston arranged at the top of the shell and a valve piston arranged at the bottom of the shell, and the bottom of the valve piston is formed with an expansion cavity, and the compression cavity is located between the valve piston and the power piston.

[0013] Further, the generator body further comprises an electric machine arranged at the bottom of the power piston, and the inside of the electric machine is provided with a main cylinder, the power piston is matched with the main cylinder, a coil is wound on the side of the power piston, and the power piston drives the coil to move to generate electric energy in cooperation with the electric machine.

[0014] Further, a plurality of plate springs are arranged at the top of the valve piston, the top of the power piston and the bottom of the damping piston respectively, and the top of the valve piston penetrates through the power piston and is connected with the plate spring.

[0015] Further, a power piston support and a valve piston support are further arranged, the power piston support is arranged at the bottom of the plate spring connected with the power piston and is fixed with the plate spring, and the valve piston support is arranged at the bottom of the plate spring connected with the valve piston and is fixed with the plate spring.

[0016] Further, a heater, a regenerator and a cooler are further arranged between the shell and the valve piston, the cooler, the regenerator and the heater are sequentially arranged from top to bottom, and the working medium flows between the compression cavity, the cooler, the regenerator, the heater and the expansion cavity to form a complete thermodynamic cycle.

[0017] Further, a method for damping a free-piston Stirling generator comprises the following steps:

[0018] When the generator body is operated, the pressure wave drives the power piston to reciprocate in the balance position under the action of the electric machine, the working medium introduced from the compression cavity with pressure wave fluctuation flows into the damping cavity through the inertia tube and the needle valve in sequence, and drives the damping piston to move, the pipe diameter, the length of the inertia tube and the opening degree of the needle valve are adjusted, so that the momentum of the power piston, the valve piston and the damping piston is zero.

[0019] The utility model discloses the beneficial effects of:

[0020] (1) The damping device for the free-piston Stirling generator disclosed by the utility model utilizes the form of adding damping pistons by compression, can realize passive damping, and can realize generator self-damping without external energy input.

[0021] (2) The damping device for the free-piston Stirling generator disclosed by the utility model utilizes an additional damping mechanism, compared with active damping and double-machine counter-damping mode, the experimental device is smaller in size and lighter in weight.

[0022] (3) The damping device for the free-piston Stirling generator disclosed by the utility model utilizes compression cavity pressure change to drive damping pistons to move, does not need to change the original structure of the generator, is lower in cost, and is simpler in structure. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural diagram of the damping device for the free-piston Stirling generator of the utility model;

[0024] In the figure: heater 1, regenerator 2, cooler 3, compression cavity 4, motor 5, power piston 6, plate spring 7, damping piston 8, additional shell 9, expansion cavity 10, gas distribution piston 11, shell 12, main body cylinder 13, inertia tube 14, power piston support 15, gas distribution piston support 16, needle valve 17, damping cylinder 18, damping cavity 19;

[0025] The utility model is further described in combination with embodiments with reference to the drawings for the purpose of realization, functional features and advantages. DETAILED DESCRIPTION

[0026] In order to more clearly and completely explain the technical scheme of the utility model, the utility model will be further described below in combination with the drawings.

[0027] Please refer to Figure 1 The damping device for the free-piston Stirling generator 5 disclosed by the utility model comprises a generator 5 main body and a damping mechanism, wherein:

[0028] The generator 5 main body is internally provided with a compression cavity 4, the damping mechanism comprises an inertia tube 14 and a damper, the damper is fixed to the outside of the generator 5 main body, the damper is internally provided with a damping piston 8, the flowing working medium led out in the compression cavity 4 flows into the damper through the inertia tube 14 and drives the damper to move and damp.

[0029] In the specific embodiment, when the generator 5 is in operation, the alternating pressure fluctuation is generated in the compression cavity 4, part of the working medium flowing out of the compression cavity 4 flows into the damper through the inertia pipe 14, and the damping piston of the damper is driven to move, so as to complete the damping, the damping of the generator 5 itself is realized by using the pressure fluctuation in the pressure cavity, and the operation is more convenient.

[0030] Further, the damper comprises an additional shell 9 which is sealingly arranged outside the generator 5, the additional shell 9 is internally provided with a damping cylinder 18, the damping cylinder 18 is internally provided with a damping piston, a damping cavity 19 is arranged between the top of the damping cylinder 18 and the additional shell 9, and the two ends of the inertia pipe 14 are connected with the compression cavity 4 and the damping cavity 19.

[0031] In the specific embodiment, the damping piston 8 is arranged in the damping cylinder 18, a damping cavity 19 is arranged between the top of the damping piston 8 and the damping cylinder 18, the damping cavity 19 is communicated with the compression cavity 4 through the inertia pipe 14, the pressure fluctuation in the compression cavity 4 causes part of the working medium to enter the damping cavity 19, and the fluctuating pressure in the damping cavity 19 causes the damping piston to reciprocate on both sides of the balance position.

[0032] Further, the damping mechanism further comprises a needle valve 17 which is arranged on the inertia pipe 14.

[0033] In the specific embodiment, the needle valve 17 is used to control the opening and closing of the inertia pipe 14, and by adjusting the opening of the needle valve 17, the pressure amplitude in the pressure wave damping cavity 19 can be adjusted.

[0034] In one embodiment, the phase and amplitude of the pressure wave can be adjusted by adjusting the pipe diameter and length of the inertia pipe 14 and the opening of the needle valve 17, and then the amplitude and phase change of the damping piston 8 can be adjusted, so as to realize the damping effect.

[0035] Further, the generator 5 further comprises an outer shell 12 which is connected with the damping mechanism.

[0036] Further, the outer shell 12 is internally provided with a power piston 6 and a valve piston 11, the power piston 6 is arranged at the top of the outer shell 12, the valve piston 11 is arranged at the bottom of the outer shell 12, the valve piston 11 is formed with an expansion cavity 10 at the bottom, and the compression cavity 4 is located between the valve piston 11 and the power piston 6.

[0037] Further, the generator 5 further comprises a motor 5 which is arranged at the bottom of the power piston 6, the motor 5 is internally provided with a main cylinder 13, the power piston 6 cooperates with the main cylinder 13, a coil is wound on the side of the power piston 6, the power piston 6 drives the coil to move, and electric energy is generated under the cooperation with the motor 5.

[0038] Further, the inner wall of the bottom of the shell 12 is provided with the heater 1, the regenerator 2 and the cooler 3, and the cooler 3, the regenerator 2 and the heater 1 are sequentially arranged from top to bottom.

[0039] Further, the power piston 6 support 15 is arranged at the bottom of the plate spring 7 connected with the power piston 6 and fixed with the plate spring 7, and the valve piston 11 support 16 is arranged at the bottom of the plate spring 7 connected with the valve piston 11 and fixed with the plate spring 7.

[0040] Further, the inner wall of the bottom of the shell 12 is provided with the heater 1, the regenerator 2 and the cooler 3, and the cooler 3, the regenerator 2 and the heater 1 are sequentially arranged from top to bottom.

[0041] In the specific embodiment, the main body of the generator 5 is the structure of the existing free piston Stirling generator 5, the heater 1 is used to absorb external heat to heat the working medium in the expansion chamber 10, the cooler 3 is used to cool the working medium in the compression chamber 4, the regenerator 2 absorbs and releases heat during the circulation of the working medium, further improving the thermal efficiency of the Stirling generator, the regenerator 2 recovers and utilizes the heat energy lost in the cooling process, and the heater 1 is responsible for providing new heat energy to maintain the operation of the system.

[0042] In one embodiment, the assembly includes the following steps:

[0043] S1. First, the heater 1 is installed in the shell 12, fixed by brazing, and the wire mesh is filled to form the regenerator 2, and the upper part of the regenerator 2 is fixed with the cooler 3 by screws;

[0044] S2. The motor 5 is fixed with the cooler 3 by screws, and then the main cylinder 13 is installed in the hole in the middle of the motor 5 and fixed with the motor 5, and then the valve piston 11 is installed in the main cylinder 13;

[0045] S3. The power piston 6 support 15 and the motor 5 are fixed and connected by screws, and then the plate spring 7 and the power piston 6 are combined into a whole and installed in the hollow position of the motor 5;

[0046] S4. One plate spring 7 is fixed with the power piston 6 support 15 and the upper part is matched with the bottom of the valve piston 11 support 16, and the other plate spring 7 is fixed with the top of the valve piston 11 support 16 to support the valve piston 11, and the entire shell 12 of the installed generator 5 main body is closed;

[0047] S5. The damping cylinder 18 is installed into the additional housing 9 and fixed by screws, then the third plate spring 7 is fixed with the damping piston 8 and installed into the damping cylinder 18 to form a damper;

[0048] S6. The damper is fixed with the generator 5 body by screws, and the inertia tube 14 is used to communicate the compression cavity 4 and the damping cavity 19.

[0049] Further, a method for damping a free-piston Stirling generator 5, comprising the following steps:

[0050] When the generator 5 body is running, the pressure wave drives the power piston 6 to reciprocate in the balance position under the action of the motor 5, the working medium drawn from the compression cavity 4 with the working medium pressure fluctuation changes in turn through the inertia tube 14, the needle valve 17 into the damping cavity 19, and drives the damping piston 8 to move, adjusts the pipe diameter, length of the inertia tube 14 and the opening of the needle valve 17, so that the momentum of the power piston 6, the valve piston 11 and the damping piston 8 is zero.

[0051] In the specific embodiment, it is assumed that m p , m d , m a are the masses of the power piston 6, the valve piston 11 and the damping piston 8 respectively, v p , v d , v a are the movement speeds of the power piston 6, the valve piston 11 and the damping piston 8 respectively, the pipe diameter, length of the inertia tube 14 and the opening of the needle valve 17 are adjusted to adjust the phase and amplitude of the pressure wave, and then the change of the piston amplitude and phase is adjusted, so that m p v p +m d v d +m a v a =0, the purpose of no vibration of the shell 12 is achieved.

[0052] Of course, the utility model can also have other various embodiments, based on the embodiment, other embodiments obtained by the ordinary skilled in the art without any creative labor belong to the range protected by the utility model.

Claims

1. A damping device for a free piston Stirling engine, characterized by The generator body and the damping mechanism, wherein: The generator body is internally provided with a compression cavity, the damping mechanism comprises an inertia tube and a damper, the damper is fixed to the outside of the generator body, the damper is internally provided with a damping piston, the flow-out working medium in the compression cavity flows into the damping cavity through the inertia tube and drives the damper to move for motion damping.

2. A vibration damping device for a free piston Stirling generator according to claim 1, characterized in that The damper comprises an additional shell, the additional shell is sealingly arranged on the outside of the generator body, the additional shell is internally provided with a damping cylinder, the damping cylinder is internally provided with a damping piston, a damping cavity is arranged between the top of the damping cylinder and the additional shell, and the inertia tube is connected with the compression cavity and the damping cavity at both ends.

3. A vibration damping device for a free piston Stirling generator according to claim 1, characterized in that The damping mechanism further comprises a needle valve, and the needle valve is arranged on the inertia tube.

4. A vibration damping device for a free piston Stirling generator according to claim 1, characterized in that The generator body further comprises a shell, and the shell is connected with the damping mechanism.

5. A vibration damping device for a free piston Stirling generator according to claim 4, characterized in that The shell is internally provided with a power piston and a valve piston, the power piston is arranged at the top of the shell, the valve piston is arranged at the bottom of the shell, an expansion cavity is formed at the bottom of the valve piston, and the compression cavity is located between the valve piston and the power piston.

6. A vibration damping device for a free piston Stirling generator according to claim 5, characterized in that The generator body further comprises a motor arranged at the bottom of the power piston, the motor is internally provided with a main cylinder, the power piston cooperates with the main cylinder, a coil is wound on the side edge of the power piston, the power piston drives the coil to move, and electric energy is generated in cooperation with the motor.

7. A vibration damping device for a free piston Stirling generator according to claim 6, characterized in that A plurality of plate springs are further arranged at the top of the valve piston, the top of the power piston and the bottom of the damping piston, the top of the valve piston penetrates the power piston and is connected with the plate spring.

8. A vibration damping device for a free piston Stirling generator according to claim 7, characterized in that A power piston support and a valve piston support are further arranged, the power piston support is arranged at the bottom of the plate spring connected with the power piston and is fixed with the plate spring, and the valve piston support is arranged at the bottom of the plate spring connected with the valve piston and is fixed with the plate spring.

9. A vibration damping device for a free piston Stirling generator according to claim 8, characterized in that A heater, a regenerator and a cooler are further arranged between the shell and the valve piston, the cooler, the regenerator and the heater are sequentially arranged from top to bottom, the working medium flows between the compression cavity, the cooler, the regenerator, the heater and the expansion cavity, and a complete thermodynamic cycle is formed.

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